Number of images formed when two plane mirrors are inclined at an angle 90° is

Which one of the following statements is not correct?

The relation, R = 2f holds true for :

A magnification greater than unity indicates :

The image formed by a convex mirror

In case of erect object having inverted image, linear magnification is :

If object lies symmetrically and number of images formed are 9, therefore two plane mirrors are kept at an angle of :

A man having height 2.5 m. He observes image of 1m height erect, then mirror used is

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

If light waves are incident on an air-water interface at an angle of 25° to the normal, what angle does the refracted ray make with the normal?

Under what conditions does a diverging lens form a virtual image of a real object?

A lens produces an enlarged, virtual image. What kind of lens is it?

In an experiment to determine the focal length of a concave lens, what should be measured to determine the focal length of the lens?

On the basis of the experiment to trace the path of a ray of light passing through a rectangular glass slab, which interpretation is correct?

Light waves are

Virtual images of objects of the same size are formed by

A bright × (cross) mark is made on a sheet of white paper. What is the distance between the image of the mark and the upper surface of the slab?

Images formed by an object placed between two plane mirrors whose reflecting surfaces make an angle of 90° with one another lie on a

A diver in a swimming pool wants to send a signal to a person lying on the edge of the pool by flashing his waterproof torch. What should be the direction of the beam of light?

Two plane mirrors are inclined at an angle θ. What will be the angle between the first ray and the final ray?

A glass slab is placed in the path of a beam of convergent light. What happens to the point of convergence of light?

A real image is formed by a convex mirror when the object is placed at

A virtual image is formed by a concave mirror when the object is placed between

Which of the following are used in a Kaleidoscope?

When a convex lens made up of glass is immersed in water, what happens to its focal length?

Find out the correct option from the following regarding magnification.

A person standing at some distance from a mirror finds his image erect, virtual, and of the same size. What type of mirror is it possibly?

Refraction of light from air to glass and from air to water are shown in the figures. What will be the value of the angle in the case of refraction as shown in figure (iii)?

The focal length of a plane mirror is

Rays from the sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that the size of its image is equal to the size of the object?

A convex mirror is used for

In case of a concave mirror, when the object is situated at the principal focus, what type of image is formed?

For an object at infinity, a concave mirror produces an image at its focus which is

For an object at infinity, a concave mirror produces an image at its focus which is

An inverted image can be seen in a convex mirror

In order to get a diminished virtual image, the object can be placed anywhere in front of a

A full length image of a distant tall building can definitely be seen by using

The concave mirrors are used in

Which of the following statements is true?

A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 12 cm. Which of the following object distance should be chosen for this purpose?

The linear magnification for a mirror is the ratio of the size of the image to the size of the object, and is denoted by m. Then, m is equal to (symbols have their usual meanings):

In case of a real and inverted image, the magnification of a mirror is

Magnification produced by a rear view mirror fitted in vehicles

The ratio of the sine of angle of incidence to the sine of angle of refraction is called

When an objects is placed between two mirrors placed inclined to each at an angle 45° Number of images formed are

Foam of soap always appears white as

A mirror is placed at an angle of 30° with respect to Y-axis. A light ray travelling in the negative y-direction strikes the mirror. The direction of the reflected ray is given by the vector

A ray of light originates from inside a glass slab and is incident on its inner surface at an angle θ as shown below. In this experiment, the location x of the spot where the ray hits the screen is recorded. Which of the following correctly shows the plot of variation of x with the angle θ?

Two convex lenses A and B each of focal length 30 cm are separated by 30 cm, as shown in the figure. An object O is placed at a distance of 40 cm to the left of lens A. What is the distance of the final image formed by this lens system?

Two plane mirrors are kept on a horizontal table making an angle θ with each other as shown schematically in the figure. The angle θ is such that any ray of light reflected after striking both the mirrors returns parallel to its incident path. For this to happen, the value of θ should be

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be

A convex lens of focal length 20 cm is cut into two halves. Each of which is placed 0.5 mm and a point object placed at a distance of 30 cm from the lens as shown. Then the image is at

Focal length of a lens is 25 cm. In dioptre, power of lens will be

When viewed vertically a fish appears to be 4 meter below the surface of the lake. If the index of refraction of water is 1.33, then the true depth of the fish is

A convex lens of focal length 25 cm receives light from the sun. A diverging lens of focal length -12 cm is placed 37 cm to the right of the converging lens. Where is the final image located relative to the diverging lens?

A camera lens focuses light from a 12.0 m tall building located 35.0 m away on film 50.0 mm behind the lens. How tall is the image of the building on the film?

A hollow lens is made of thin glass and in the shape of a double concave lens. It can be filled with air, water of refractive index 1.33 or CS2 of refractive index 1.6. It will act as a diverging lens, if it is

A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15 cm from a converging lens of magnitude of focal length 20 cm. A beam of parallel light falls on the diverging lens. The final image formed is:

A glass beaker is filled with water up to 5 cm. It is kept on top of a 2 cm thick glass slab. When a coin at the bottom of the glass slab is viewed at the normal incidence from above the beaker, its apparent depth from the water surface is d cm. Value of d is close to (the refractive indices of water and glass are 1.33 and 1.5, respectively)

A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is:

Light travels through a vacuum at a speed c = 3 × 10^8 m/s. It can also travel through many materials, such as air, water and glass. Atoms in the material absorb, reemit and scatter the light, however. Therefore, light travels through the material at a speed that is less than c, the actual speed depending on the nature of the material. To describe the extent to which the speed of light in a material medium differs from that in a vacuum, we use a parameter called the index of refraction. Figure shows a ray of light as it travels from medium A to medium B. Retractive index of the medium B relative to medium A is

A light ray enters from medium A to medium B as shown in the figure. The refractive index of medium B relative to A will be

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students shown as A, B, C and D in the figure. Which one of them is correct?

You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at same angle would bend the most?

A ray of light is incident in medium 1 on a surface that separates medium 1 from medium 2. Let v1 and v2 represent the velocity of light in medium 1 and medium 2 respectively. Also let n12 and n21 represent the refractive index of medium 1 with respect to medium 2 and refractive index of medium 2 with respect to medium 1, respectively. If i and r denote the angle of incidence and angle of refraction, then-