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12th Physics Monthly Test - 1 (Optics )

St. Britto Hr. Sec. School - Madurai

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

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

In a Young's double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to,

2D
\(\frac { D }{ 2 } \)
\(\sqrt { 2D } \)
\(\frac { D }{ \sqrt { 2 } } \)

An object is placed 40 cm from a concave mirror of focal length 20 cm, the image formed is

Real, inverted and same in size
Real, inverted and smaller
Virtual, erect and larger
Virtual, erect and smaller

Two plane mirrors A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 30° at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is)

28
30
32
34

To get three images of a single object, one should have two plane mirror at an angle of

30°
60°
90°
120°

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 concave mirror is used to focus the image of a flower on a nearby well 120 cm from the flower. If a lateral magnification of 16 is desired, the distance of the flower from the mirror should be

8 cm
12 cm
80 cm
120 cm

A concave mirror forms an image of sun at a· distance of 12 cm from it

The radius of curvature of this mirror is 6 cm
To use it as a shaving mirror, it must be held at a distance of 8 -10 cm from the face
If an object is kept at a distance of 12 cm from it, the image formed will be same size as the object
All the above

If an object is placed10 cm in front of a concave mirror of focal length 20 cm, the image of 3 cm height one needs a

Diminished, upright, virtual
Enlarged, upright, virtual
Diminished, inverted, real
Enlarged, upright, real

A ray of light is incidenting normally on a plane mirror. The angle of reflection will be

0^o
90°
will not be reflected
None of these

The image formed by a convex mirror of a real object is larger than the object

when \(\mu \) < 2 f
when \(\mu \) > 2 f
or all values of \(\mu \)
for no value of \(\mu \)

For light incident from air on a slab of refractive index 2. Maximum possible angle of refraction is,

30°
45°
60°
90°

An object is at a distance of 0.5 in front of a plane mirror. Distance between the object and image is

0.5 m
1 m
7
8

The radius of curvature of curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be,

5 cm
10 cm
15 cm
20 cm

A plane mirror produces a magnification of

-1
+1
Zero
Between· 0 and + \(\infty \)

An object 2.5 em high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm. The size of the image is
9.2 cm

10.5 cm

5.6 cm

7.5 cm
A man runs towards a mirror at a speed 15 m/s. The speed of the image relative to the man is
15 ms^-1

30 ms^-1

35 ms^-1

20 ms^-1

Part - B

Generic 2 - Answer All Question

What are coherent sources of light?

What is intensity division?

In a single-slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band?

Write a short note on quantum theory of light.

A polaroid (I) is placed in front of a monochromatic source. Another-polaroid (II) is placed in front of this polaroid (I) and rotated till no light passes. A third polaroid (III) is now placed in between (I) and (II). In this case, will light emerge from (II)? Explain.

What is astigmatism?

What is spectrum?

Why is oil immersed objective preferred in a microscope?

What are coherent sources?
A lens whose radii of curvature are different is forming the image of an object placed on its axis. If the surfaces of the lens facing the object and image are interchanged will the position of the image change?

What is angle of deviation due to reflection? .

Define centre of curvature.

Write a short notes on the prisms making use of total internal reflection.

What is polarisation?
What is wave theory of light?

What are plane polarised, unpolarised and partially polarised light?

Write the uses of nicol prism.

Part - C

Generic 3 - Answer All Question

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

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

Write the difference between paraxial rays and marginal rays.

What is thin lens?

Write the drawbacks of Nicol prism.

Write the conditions for nature of objects and images.

What is principal axis of the mirror?

Use the lens equation to deduce algebraically the following :

"An object placed within the focus of a convex lens produces a virtual and enlarged image"
Discuss difraction at single slit and obtain the condition for n^th maxima.

What is Airy's discs?

The image of a candle is formed by a convex lens on a screen. The lower half of the lens is painted black to make it completely opaque. Draw the ray diagram to show the image formation. How will this image be different from the one obtained when the lens is not painted black?

Part - D

Generic 5 - Answer All Question

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.

Light falls from glass (\(\mu\) = 1.5) to air. Find the angle of incidence for which the angle of deviation is 90°.
Prove laws of reflection using Huygens' principle.

Derive the equation for refraction at single spherical surface.

Mention different parts of spectrometer and explain the preliminary adjustments.

An optical instrument used for angular magnification has a 25 D objective and a 20D eyepiece. The tube length is 25 ern when the eye is least strained. (a) Whether it is a microscope or a telescope? (b) What is the angular magnification produced?

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