12th Physics weekly Test -1 ( Optics )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test -1 ( Optics )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Radius of curvature of convex mirror is 40 cm and the size of object is twice as that of image than the image distance is

10 cm
20 cm
40 cm
30 cm

Two plane mirror are at right angles to each other. A man stands between them and combs hair with his right hand. In how many of the
images will he be seen using his right hand.

None
1
2
3

An object is placed in front of a convex; mirror of focal length off and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified.

2f and c
c and \(\infty \)
f and O
None of these

For the largest distance of the image from a concave mirror of focal length 10 cm, the object should be kept at

10 cm
Infinite
40 cm
60 cm

An object of ,length 6 cm is planed on the principal axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be

2 cm
12 cm
4 cm
1.2 cm

What should be the angle between two plane mirror so that whatever be · the angle of incidence, the incident ray and the reflected ray
from the two mirrors be parallel to each other

60°
90°
120°
175°

A light bulb is placed between two mirrors (plane) inclined at an angle of 60°. Number of images formed are

Radius of curvature of concave mirror is 40 cm and the size of image is twice as that of object, then the object distance is

60 cm
20 cm
40 cm
30 cm

Two plane mirrors are at 45° to each other. If an object is placed between them than the number of images will be

A boy stands straight infront of a mirror at a distance of 30 cm away from it. He sees his erect image whose height is \(\frac { { 1 }^{ th } }{ 5 } \) of his real height. The mirror he is using is
plane mirror

convex mirror

concave lens

plano-convex mirror
The light reflected by plane mirror may form a real images.
If the rays incident on the mirror are diverging

If the rays incident on the mirror are converging

If the object is placed very close to mirror

Under no circumstance

Part - B

Generic 2 - Answer All Question

Define radius of curvature

What type of lens is formed by a bubble inside water?
Write the expression for angular resolution

What are the uses of spectrometer?

Differentiate between polarised and unpolarised light

What is Rayleigh's scattering?

Part - C

Generic 3 - Answer All Question

What is principal axis of the mirror?

What is focus (or) focal point of a mirror?

What is Airy's discs?

Write the conditions for obtaining clear and broad interference bands.
Define refractive index of a medium.

Write the difference between paraxial rays and marginal rays.

Part - D

Generic 5 - Answer All Question

The critical angle for a given piece of glass is 45°. Calculate the polarising angle for it. Also calculate the angle of refraction when light is
incident on this glass at an angle of incident equal to i_p.

A compound microscope has a magnification of 30. The focal length of eye piece is 5 cm. Assuming the final image to be at least ,distance of distinct vision, find the magnification produced by the objective.

Two polaroids are set in crossed positions. A third polaroid is placed between the two making an angle \(\theta\) with the pass axis of the first polaroid. Write the expression for th-e intensityof light transmitted from the second polaroid. In what orientations will the transmitted·intensity be (i) minimum and (ii) maximum.
Derive the equation for lateral magnification in spherical mirrors.

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12th Physics weekly Test -1 ( Optics )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test -1 ( Optics )-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

Radius of curvature of convex mirror is 40 cm and the size of object is twice as that of image than the image distance is

Two plane mirror are at right angles to each other. A man stands between them and combs hair with his right hand. In how many of the images will he be seen using his right hand.

An object is placed in front of a convex; mirror of focal length off and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified.

For the largest distance of the image from a concave mirror of focal length 10 cm, the object should be kept at

An object of ,length 6 cm is planed on the principal axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be

What should be the angle between two plane mirror so that whatever be · the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other

A light bulb is placed between two mirrors (plane) inclined at an angle of 60°. Number of images formed are

Radius of curvature of concave mirror is 40 cm and the size of image is twice as that of object, then the object distance is

Two plane mirrors are at 45° to each other. If an object is placed between them than the number of images will be

A boy stands straight infront of a mirror at a distance of 30 cm away from it. He sees his erect image whose height is \(\frac { { 1 }^{ th } }{ 5 } \) of his real height. The mirror he is using is

The light reflected by plane mirror may form a real images.

Part - B

Generic 2 - Answer All Question

Define radius of curvature

What type of lens is formed by a bubble inside water?

Write the expression for angular resolution

What are the uses of spectrometer?

Differentiate between polarised and unpolarised light

What is Rayleigh's scattering?

Part - C

Generic 3 - Answer All Question

What is principal axis of the mirror?

What is focus (or) focal point of a mirror?

What is Airy's discs?

Write the conditions for obtaining clear and broad interference bands.

Define refractive index of a medium.

Write the difference between paraxial rays and marginal rays.

Part - D

Generic 5 - Answer All Question

The critical angle for a given piece of glass is 45°. Calculate the polarising angle for it. Also calculate the angle of refraction when light is incident on this glass at an angle of incident equal to ip.

A compound microscope has a magnification of 30. The focal length of eye piece is 5 cm. Assuming the final image to be at least ,distance of distinct vision, find the magnification produced by the objective.

Derive the equation for lateral magnification in spherical mirrors.

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Two plane mirror are at right angles to each other. A man stands between them and combs hair with his right hand. In how many of the
images will he be seen using his right hand.

What should be the angle between two plane mirror so that whatever be · the angle of incidence, the incident ray and the reflected ray
from the two mirrors be parallel to each other

The critical angle for a given piece of glass is 45°. Calculate the polarising angle for it. Also calculate the angle of refraction when light is
incident on this glass at an angle of incident equal to i_p.