RAY OPTICS

Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted. Which of the following is not correct.

• The apparent depth of the points close to the edge are nearer the surface of the water compared to the points away from the edge.

• The angle subtended by the image of the object at the eye is smaller than the actual angle subtended by the object in air.

• Some of the points of the object far away from the edge may not be visible because of total internal reflection.

• Water in a trough acts as a lens and magnifies the object.

Tags

NGSS.HS-PS4-5

Critical angle and refractive index are:

• Directly related

• Equal

• Inversely related

• None of these

A point source of light is placed in front of a plane mirror.

• All the reflected rays meet at a point when produced backward.

• Only the reflected rays close to the normal meet at a point when produced backward

• Only the reflected rays making a small angle with the mirror, meet at a point when produced backward

• Light of different colours make different images

Mark the correct options:

• If the incident rays are converging, we have a real object.

• If the final rays are converging, we have a real image.

• The image of a virtual object is called a virtual image.

• If the image is virtual, the corresponding object is called a virtual object.

An object is placed at a distance of 0.5 m in front of a plane mirror. The distance between object and image will be:

• 0.25 m

• 0.5 m

• 1.0 m

• 2.0 m

Tags

NGSS.MS-PS4-2

For a total internal reflection, which of the following is correct?

• Light travels from rarer to denser medium.

• Light travels from denser to rarer medium.

• Light travels in air only.

• Light travels in water only.

Mirage is a phenomenon due to:

• Refraction of light

• Reflection of light

• Total internal reflection of light

• Diffraction of light

You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90°. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?

• The beam of red light would undergo total internal reflection.

• The beam of red light would bend towards normal while it gets refracted through the second medium.

• The beam of blue light would undergo total internal reflection.

• The beam of green light would bend away from the normal as it gets refracted through the second medium.

Tags

NGSS.HS-PS4-5

The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in figure the path shown is correct?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

An object of height 1 cm is kept at a distance of 40 cm from a concave spherical surface (R = 20 cm) separating air and glass (μ = 1.33). The location of the image formed is:

• - 32 cm

• + 16 cm

• -18 cm

• + 26 cm