Ray Optics Test

Result

Ray Optics Test - 99

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Weekly Quiz Competition

Question 1
4 / -1

A diverging beam of light from a point source S having divergence angle α, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of theemergent beam is

A
Zero

B
α

C
sin^–1 (1/n)

D
2 sin^–1 (1/n)

Solution
Question 2
4 / -1

A
16 cm above water level

B
9 cm above water level

C
24 cm below water level

D
9 cm below water level

Solution
Question 3
4 / -1

An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in the figure. The beaker height is 3h and its radius h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then, the refractive index of theliquid is

A

B

C

D

Solution
Question 4
4 / -1

A ray of light is incident at the glass-water interface at an angle i, it emerges finally parallel to the surface of water, then the value of μ_gwould be

A
(4/3)sin i

B
1/sin i

C
4/3

D
1

Solution
Question 5
4 / -1

A glass prism (μ = 1.5) is dipped in water (μ = 4/3) as shown in figure. A light ray is incident normally on the surface AB. It reaches the surface BC after totally reflected, if

A
sin θ ≥ 8/ 9

B
2/3 < sin θ < 8/9

C
sin θ ≤ 2/3

D
It is not possible

Solution
Question 6
4 / -1

A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with the distance dbetween them. If a parallel beam of light falling on A leaves B as a parallel beam, then distance d in cm will be

A
25

B
15

C
30

D
50

Solution
Question 7
4 / -1

Diameter of a plano-convex lens is 6 cm and thickness at the centre is 3 mm. If the speed of light in the maternal of the lens is 2 × 10⁸ m/s, the focal length ofthe lens is

A
15 cm

B
20 cm

C
30 cm

D
10 cm

Solution
Question 8
4 / -1

A point object Ois placed on the principal axis of a convex lens of focal length 20 cm at a distance of 40 cm to the left of it. The diameter of the lens is 10 cm. If the eye is placed 60 cm to the right of the lens at a distance hbelow the principal axis, then the maximum value of hto see the image will be

A
0

B
5 cm

C
2.5 cm

D
10 cm

Solution
Question 9
4 / -1

A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids L₁ and L₂having refractive indices n₁ and n₂ respectively (n₂> n₁> 1). The lens will diverge a parallel beam of light if it is filled with

A
Air and placed in air

B
Air and immersed in L₁

C
L₁ and immersed in L₂

D
L₂and immersed in L₁

Solution
Question 10
4 / -1

A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of30 cm from the lens. The final image is

A
Virtual and at a distance of 16 cm from mirror

B
Real and at distance of 16 cm from the mirror

C
Virtual and at a distance of 20 cm from the mirror

D
Real and at a distance of 20 cm from the mirror

Solution