Ray Optics Test

Result

Ray Optics Test - 114

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Weekly Quiz Competition

Question 1
4 / -1

A ray of light strikes a plane mirror Mat an angle of 45° as shown in the figure. After reflection, the ray passes through a prism of refractive index 1.5 whose apex angle is 4°. The total angle through which the ray is deviated is

A
90°

B
91°

C
92°

D
93°

Solution
Question 2
4 / -1

A slab of glass, of thickness 6 cm and refractive index 1.5, is placed in front of a concave mirror, the faces of the slab being perpendicular to the principal axis of the mirror. If the radius of curvature of the mirror is 40 cm and the reflected image coincides with the object, then the distance of the object from the mirror is

A
30 cm

B
22 cm

C
42 cm

D
28 cm

Solution
Question 3
4 / -1

A point source of light S is placed at the bottom of a vessel containing a liquid of refractive index 5/3. A person is viewing the source from above the surface. There is an opaque disc D of radius 1 cm floating on the surface of the liquid. The centre of the disc lies vertically above the source S. The liquid from the vessel is gradually drained out through a tap. The maximum height of the liquid for which the source cannot be seen at all from above is

A
1.50 cm

B
1.64 cm

C
1.33 cm

D
1.86 cm

Solution
Question 4
4 / -1

A point object is placed mid-way between two plane mirrors distance \'a\' apart. The plane mirror forms an infinite number of images due to multiple reflection. The distance between the nth order image formed in the two mirrors is

A
na

B
2na

C
na/2

D
n² a

Solution
Question 5
4 / -1

A convergent beam of light is incident on a convex mirror so as to converge to a distance 12 cm from the pole of the mirror. An inverted image of the same size is formed coincident with the virtual object. What is the focal length of the mirror

A
24 cm

B
12 cm

C
6 cm

D
3 cm

Solution
Question 6
4 / -1

PQR is a right angled prism with other angles as 60° and 30°. Refractive index of prism is 1.5. PQ has a thin layer of liquid. Light falls normally on the face PR. For total internal reflection, maximum refractive index of liquid is

A
1.4

B
1.3

C
1.2

D
1.6

Solution
Question 7
4 / -1

In a given direction, the intensities of the scattered light by a scattering substance for two beams of light are in the ratio of 256 : 81. The ratio of the frequency of the first beam to the frequency of the second beam is

A
64 : 127

B
4 : 3

C
64 : 27

D
2 : 1

Solution
Question 8
4 / -1

Two thin lenses, when in contact, produce a combination of power + 10 D. When they are 0.25 m apart, the power reduces to + 6D. The focal lengths of the lenses (in m) are

A
0.125 and 0.5

B
0.125 and 0.125

C
0.5 and 0.75

D
0.125 and 0.75

Solution
Question 9
4 / -1

The plane faces of two identical plano convex lenses, each with focal length f are pressed against each other using an optical glue to form a usual convex lens. The distance from the optical centre at which an object must be placed to obtain the image same as the size of object is

A

B

C

D

Solution
Question 10
4 / -1

A parallel beam of light emerges from the opposite surface of the sphere when a point source of light lies at the surface of the sphere. The refractive index of the sphere is

A

B

C
2

D

Solution