Ray Optics and Optical Test

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Ray Optics and Optical Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

What is a virtual image?

A
The image that cannot be caught on a screen

B
The image that can be caught on a screen

C
The image that cannot be converged on a screen

D
None

Solution

Hint:
The virtual image is formed by the imaginary light rays. The imaginary light rays do not form the image on the screen.
Step 1: Explaining the image formation,
$$\bullet$$When the actual rays diverge then they can never meet to form an image. Therefore the rays are assumed to meet in the backward direction of their propagation.
$$\bullet$$As the imaginary light rays meet and form the image, therefore the image can not be caught on a screen.
$$\textbf{Hence, option (A) is the correct answer.}$$
Question 2
1 / -0

What kind of image is obtained always for concave lens?

A
Virtual, Erect and Diminished

B
Real, Erect and Large

C
Real, Erect and Diminished

D
All of these

Solution

As can be seen in image, Virtual, Erect and Diminished image is obtained always for concave lens
Question 3
1 / -0

Why is the focal point for any convex lens a little inexact with ordinary white light?

A
White light has a very long wavelength, compared to other colors.

B
White light has a very short wavelength, compared to other colors.

C
White light is made up of colors of light, which bend different amounts as they pass through the lens.

D
White light bends more than all the other colors.

E
White light bends less than all the other colors.

Solution

The focal length of a convex lens is given by
$$\dfrac{1}{f}=(\dfrac{n_{material}}{n_{medium}}-1)(\dfrac{2}{R})$$
Since the refractive index of material is different for different colours, the focal length of the lens is different for them. Hence the constituents of white light bend by different amounts.
Question 4
1 / -0

Which of the following will produce greater chromatic aberration?

A
thick lens

B
thin lens

C
both produce equal chromatic aberration

D
insufficient information

Solution

A lens may be considered as made up of a number of prisms placed one above the other. In a thick lens, the angles of prisms are larger than those in a thin lens. Since, angular dispersion produced by a prism is directly proportional to the angle of prism, a thick lens suffers from greater chromatic aberration.
Question 5
1 / -0

Which of the following has a larger chromatic aberration?

A
crown-glass lens

B
flint-glass lens

C
both have equal chromatic aberration

D
insufficient information

Solution

Flint-glass lens has a larger chromatic aberration because the dispersive power of flint-glass is higher.
Question 6
1 / -0

Which of the following will produce smaller chromatic aberration?

A
thick lens

B
thin lens

C
both will produce equal chromatic aberration

D
insufficient information

Solution

Chromatic aberration is very common with single thin lenses and produces smaller chromatic aberration.
Question 7
1 / -0

Which of the following has a smaller chromatic aberration?

A
crown-glass lens

B
flint-glass lens

C
both have equal chromatic aberration

D
insufficient information

Solution

Crown glass lens are used to reduce chromatic aberrations which is due to dispersion of glasses partially compensating each other.
Question 8
1 / -0

The relation between $$n_{1}$$ and $$n_{2}$$, if the behaviour of light ray is as shown in the figure.

A
$$n_{2}>n_{1}$$

B
$$n_{1}>>n_{2}$$

C
$$n_{1}>n_{2}$$

D
$$n_{1}=n_{2}$$

Solution

Nature of lens changes, if $$\mu_{medium} > \mu_{lens}$$
hence option A is correct.
Question 9
1 / -0

An ellipsometer is an instrument for.

A
Measuring stellar distance

B
Measuring the path of celestial bodies

C
Ending curvature of elliptical surfaces

D
Studying thin films on a solid surface

Solution

An ellipsometer is a device used for studying thin films on a solid surface.
Ellipsometry is an optical technique for investigating the di electric properties of thin films.
Question 10
1 / -0

A ray of light travels from a denser to a rarer medium then, the ray :

A
doesn't bend at all

B
bends towards the normal

C
bends away from the normal

D
goes along the normal

Solution

When light travels from denser to rarer medium, the velocity of light increases which results in bending of light away from the normal.

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Re-Attempt Weekly Quiz Competition

Ray Optics and Optical Test - 20

Result

Ray Optics and Optical Test - 20

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SHARING IS CARING

Question 1

The image that cannot be caught on a screen

The image that can be caught on a screen

The image that cannot be converged on a screen

None

Solution

Question 2

Virtual, Erect and Diminished

Real, Erect and Large

Real, Erect and Diminished

All of these

Solution

Question 3

White light has a very long wavelength, compared to other colors.

White light has a very short wavelength, compared to other colors.

White light is made up of colors of light, which bend different amounts as they pass through the lens.

White light bends more than all the other colors.

White light bends less than all the other colors.

Solution

Question 4

thick lens

thin lens

both produce equal chromatic aberration

insufficient information

Solution

Question 5

crown-glass lens

flint-glass lens

both have equal chromatic aberration

insufficient information

Solution

Question 6

thick lens

thin lens

both will produce equal chromatic aberration

insufficient information

Solution

Question 7

crown-glass lens

flint-glass lens

both have equal chromatic aberration

insufficient information

Solution

Question 8

$$n_{2}>n_{1}$$

$$n_{1}>>n_{2}$$

$$n_{1}>n_{2}$$

$$n_{1}=n_{2}$$

Solution

Question 9

Measuring stellar distance

Measuring the path of celestial bodies

Ending curvature of elliptical surfaces

Studying thin films on a solid surface

Solution

Question 10

doesn't bend at all

bends towards the normal

bends away from the normal

goes along the normal

Solution

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