GRADE 10 LENS, HUMAN EYES AND DISPERSION

Lens

By Physics GRADE 10

Multiple Choice

The above lens is a type of ___.

• diverging lens

• converging lens

• divergent lens

• convergent lens

Multiple Choice

Which lens represents the path light takes through a diverging lens?

Multiple Choice

Which figure represents the path light takes through a converging lens?

Multiple Choice

Which diagram shows how an image of an object is formed on a screen by a converging lens?

• A

• B

• C

• D

Multiple Choice

A real image...

• is produced by virtual rays and can be projected on a screen

• is produced by real rays and cannot be projected on a screen

• is produced by virtual images and cannot be projected on a screen

• is produced by real rays and can be projected on a screen

Multiple Choice

A virtual image is formed by...

• the actual intersection of light rays, cannot be formed on a screen

• the apparent intersection of light rays, cannot be formed on a screen

• the actual intersection of light rays, can be formed on a screen

• the apparent intersection of light rays, can be formed on a screen

Multiple Choice

if the object is beyond C (2F)

• image is real, diminished and upright

• image is real, diminished and inverted

• image is virtual, diminished and inverted

• image is real, enlarged and upright

Multiple Choice

What kind of image is always formed in a diverging (concave) lens?

• Virtual image

• Real image

Multiple Choice

An object is placed in front of a converging lens. The lens has a focal length f. The lens produces a real, enlarged image of the object. In which labelled position is the object placed?

• A

• B

• C

• D

Multiple Choice

When an object is placed between the focus and the convex lens, the image produced is ___.

• real, diminished, and inverted

• real, magnified, and inverted

• virtual, magnified, and upright

• virtual, diminished, and upright

Multiple Select

An image is formed on

• Iris

• Pupil

• Retina

• Cornea

Multiple Select

The shape of eye-ball is nearly _________________

• Elliptical

• Oval

• Circular

• Spherical

Multiple Choice

Following controls and regulates the amount of light entering the eye

• Iris

• Pupil

• Retina

• Corena

Multiple Select

_________________ send signals to the brain

• Optical nerve

• Aqueous Humour

• Viterous humour

• Eye lens

Multiple Choice

The image formed by retina of human eye is

• Real and inverted

• Virtual and inverted

• Virtual and erect

• Real and erect

Multiple Choice

The defect of the eye in which the eyeball becomes too long is

• hypermetropia

• myopia

• cataract

• presbyopia

Multiple Select

The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called

• far-sightedness

• near-sightedness

• presbyopia

• All of above

Multiple Select

Following is true for Hypermetropia

• It can be corrected by using a convex lens

• It may arise when focal length of eye lens is too long

• it may arise when eyeball has become too small

• all of above

Multiple Choice

Myopia or short sightedness can be corrected using

• convex lens

• multifocal lens

• concave lens

• focal lens

Drag and Drop

A person uses bifocal glasses [combination of convex and concave lenses] as he suffers from long and short sightedness. The bifocal glasses use ​ ​ ​

Placeholder

lens to correct the long sightedness i.e inability to see ​

Placeholder

objects clearly.

To correct the inability of seeing ​

Placeholder

objects also called short sightedness, he uses

Placeholder

G lens.Which row gives the correct responses to the statements?​

Drag these tiles and drop them in the correct blank above

CONVERGING

NEAR

DISTANT

DIVERGING

DISPERSION OF LIGHT

White is not actually a specific color - it is made of ALL colors mixed together

A PRISM (a piece of glass or crystal, often triangular in shape) can be used to split a beam of white light into the RAINBOW it is made from through a process called DISPERSION.

​

What is the wavelength of white light?

When white light passes through a prism, the different WAVELENGTHS of light that make it up bend slightly different amounts.

The LONGER the wavelength, the LESS the wave bends.

RED bends LESS than VIOLET because it has a LONGER wavelength.

​

Dispersion through a prism

Multiple Choice

The splitting of white light into the seven colors when it passes through a transparent material is called

• Refractrion

• Dispersion

• Reflection

• Diffraction

Multiple Choice

When white light passes through a prism,

• red bends more, violet bends least

• red bends least, violet bends most

• dispersion doesn't occur

• refraction doesn't occur

Multiple Choice

When white light enters a prism, it gets split into its constituent colours. This is due to

• different refractive index for different wavelength of each colour

• each colours has same velocity in the prism.

• prism material have high density.

• Scattering of light

Multiple Choice

The colored light that refracts most while passing through a prism is

• Red

• Yellow

• Blue

• Violet

Multiple Choice

A ray of white light enters the raindrop and undergoes __________ and __________ to form a spectrum.

• refraction; dispersion

• reflection; dispersion

• dispersion; diffraction

• scattering; dispersion

Multiple Choice

A compact disc is held with its mirror face facing the light source. A coloured pattern is formed on the disc. Which phenomenon is responsible for the pattern?

• reflection

• refraction

• polarisation

• dispersion