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12th Physics weekly Test - 2 ( Optics )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test - 2 ( Optics )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Ray optics is valid, when characteristic dimensions are

of the same order as the wave length of light
much smaller then the wavelength of light
of the order of one millimeter
much larger than the wavelength of light

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

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

An object place infront of a plane mirror is displaced by 0.4 m along a straight line at angle of 30° to mirror plane, the change in the distance between the object and its image is

0.20 m
0.40 m
0.25 m
0.80 m

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 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

It is desired to photograph the image of an object placed at a distance of 3m from the plane mirror. The camera which is at a distance
of 4.5 m from the mirror should be focused for a distance of

3 m
4.5 m
6 m
7.5 m

If the velocity and wavelength of light in air is v_a and \(\lambda _a\) and that in water is v_wand \(\lambda _w\) then the refractive index of water is,

\(\frac { { V }_w }{ { V }_{ a } } \)
\(\frac { { V }_a }{ { V }_{ w } } \)
\(\frac { \lambda _{ w } }{ { \lambda }_{ a } } \)
\(\frac { { V }_{ a }\lambda _{ w } }{ { { V }_{ w }\lambda }_{ a } } \)

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 man of length h requires a mirror of length at least equal to, to see his own complete image

\(\frac { h }{ 4 } \)
\(\frac { h }{ 3 } \)
\(\frac { h }{ 2 } \)
h

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

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is,

2.5cm
5 cm
10 cm
15 cm

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

30°
60°
90°
120°

An object is placed at 20 cm from a convex mirror of focal length 10 cm. The image formed by the mirror is

Real and 20 cm from the mirror
Virtual and at 20 crn from the mirror
Virtual and 20/3 cm from the mirror
Real and 20/3 cm from the mirror

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 ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45°. The ray can undergo total internal reflection for the following n,

n = 1.25
n = 1.33
n = 1.4
n = 1.5

When light is incident on a soap film of thickness 5 x 10^-5 em, the wavelength of light reflected maximum in the visible region is 5320 \(\mathring { A } \). Refractive index of the film will be

1.22
1.33
1.51
1.83

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

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

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°

Part - B

Generic 5 - Answer All Question

Discuss the experiment to determine the wavelength of monochromatic light using diffraction grating.

In Young's double slit experiment, the slits are 2 mm apart and are illuminated with a mixture of two wavelength \(\lambda_0\) = 750 nm and \(\lambda\) = 900 nm. What is the minimum distance from the common central bright fringe on a screen 2 m from the slits where a bright fringe from one interference pattern coincides with a bright fringe from the other?

What is angle of deviation due to refraction?

In Young's double slit experiment, 62 fringes are seen in visible region for sodium light of wavelength 5893 \(\mathring { A } \). If violet light of wavelength 4359 \(\mathring { A } \) is used in place of sodium light, then what is the number of fringes seen?

Explain about compound microscope and obtain the equation for magnification.

In figure the direct image formed by the lens (f = 10 cm) of an object placed at O and that formed after reflection from the spherical mirror are formed at the same point 'O'. What is the radius of curvature of the mirror?

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