Ray Optics Test

Result

Ray Optics Test - 100

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Weekly Quiz Competition

Question 1
4 / -1

Which one of the following spherical lenses does not exhibit dispersion? The radii of curvature of thesurfaces of the lenses are as given in the diagrams

A

B

C

D
Question 2
4 / -1

The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size ofthe image

A
1.25 cm

B
2.5 cm

C
1.05 cm

D
2 cm

Solution
Question 3
4 / -1

An achromatic prism is made by crown glass prism(A_c = 19°) and flint glass prism (A_f = 6°).If ^Cμ_v= 1.5 and ^Fμ_v = 1.66, then resultant deviation forred coloured ray will be

A
1.04°

B
5°

C
0.96°

D
13.5°

Solution
Question 4
4 / -1

The refracting angle of prism is A and refractive index of material of prism is cot A/2. The angle of minimumdeviation is

A
180°– 3A

B
180° + 2A

C
90°– A

D
180° – 2A

Solution
Question 5
4 / -1

An isosceles prism of angle 120° has a refractive index of 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerging from the opposite faces

A
Are parallel to each other

B
Are diverging

C
Make an angle 2 sin^–1 (0.72) with each other

D
Make an angle 2{sin^–1 (0.72)–30°} with each other

Solution
Question 6
4 / -1

A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. Ifµ is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from thehypotenuse is

A

B

C

D

Solution
Question 7
4 / -1

A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be

A
3.0

B
2.0

C
2.5

D
1.5

Solution
Question 8
4 / -1

A car is fitted with a convex side-view mirror of focal length 20cm. A second car 2.8m behind the first car is overtaking the first car at a relative speed of 15m/s. The speed of the image of the second car as seen in themirror of the first one is

A

B

C

D

Solution
Question 9
4 / -1

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as [g = 10 m/s²]

A
9 m/s

B
12 m/s

C
16 m/s

D
21.33 m/s

Solution
Question 10
4 / -1

A small source of light is to be suspended directly above the centre of a circular table of radius R. What should be the height of the light source above the table so that the intensity of light is maximum at the edges of the table compared to any other height of the source

A

B

C
R

D

Solution