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12th Physics weekly Test - 3 ( Optics )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test - 3 ( Optics )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

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

30°
60°
90°
120°

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 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

Two plane mirrors are parallel to each other an spaced 20cm apart. An object is kept in between them at 15cm from A out of the
following at which point on image is not formed in mirror A (distance measured from mirror A)

15 cm
25 cm
45 cm
55 cm

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

A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is,

red
yellow
green
violet

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

Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are

5I and I
5I and 3I
9I and I
9I and 3I

A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is

5 cm
12 cm
10 cm
20 cm

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

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

A convex mirror of focal length 10 cm forms an image which is half of the size of the object. The distance of the object from the mirror is

10 cm
12 cm
5 cm
15 cm

Under which of the following conditions will a convex mirror of focal length f produce an image that is erect diminished and virtual

nly when 2f > u > f
only when u = f
onlywhen u < f
always

A plane mirror produces a magnification of

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

A concave mirror gives an images three times as large as the object placed at a distance of 20 cm from it. For the images to be real, the length should be

10 cm
15 cm
20 cm
30 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°

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

The transverse nature of light is shown in,

interference
diffraction
scattering
polarisation

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

An object 5 cm tall is placed lm from a concave spherical mirror which has a radius of curvature of 20 cm. The size of the image is

0.11 cm
0.50 cm
0.55 cm
0.60 cm

In a concave mirror experiment, an object is placed at a distance x, from, the focus and the image is formed at a disfance x₂ from the focus. The focal length of the mirror would be

x₁ x₂
\(\sqrt { { x }_{ 1 }{ x }_{ 2 } } \)
\(\quad \frac { { x }_{ 1 }+{ x }_{ 2 } }{ 2 } \)
\(\sqrt { \frac { { x }_{ 1 } }{ { x }_{ 2 } } } \)

Light transmitted by Nicol prism is,

partially polarised
unpolarised
plane polarised
elliptically polarised

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

A rear mirror of a vehicle is cylindrical having radius of curvature 10 cm. The length of arc of curved surface is also 10 cm. If the eye of driver is assumed to be at large distance, from the mirror, then the field of view in radian is

0.5
1
2
4

Convergence of concave mirror can be decreased by dipping in

Water
Oil
Both
None of these

A small object is placed 10 cm infront of a plane mirror. If you stand behind the object 30 em from the object and look at its image, the
distance foursed for your eye will be
60 cm

20 cm

40 cm

80 cm
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

First diffraction minimum due to a single slit of width 1.0 x 10^-5 cm is at 30°. Then wavelength of light used is,

400\(\mathring { A } \)
500\(\mathring { A } \)
600\(\mathring { A } \)
700\(\mathring { A } \)

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

5
9
7
8

An object is initially at a distance of 100 cm from plane mirror. If the mirror approaches the object at a speed of 5 cm/s, then after 6 s the distance betWeen the object and its images will be

60 cm
140 cm
170 cm
150 cm

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

2
4
5
6

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