Ray Optics Test

Result

Ray Optics Test - 103

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Weekly Quiz Competition

Question 1
4 / -1

A fish rising vertically up towards the surface of water with speed 3 ms^–1 observes a bird diving vertically down towards it with speed 9 ms^–1. The actual velocity of bird is

A
4.5 ms^–1

B
5 ms^–1

C
3.0 ms^–1

D
3.4 ms^–1

Solution
Question 2
4 / -1

A beaker containing liquid is placed on a table, underneath a microscope which can be moved along a vertical scale. The microscope is focused, through the liquid onto a mark on the table when the reading on the scale is a. It is next focused on the upper surface of the liquid and the reading is b. More liquid is added and the observations are repeated, the corresponding readings are c and d. The refractive index of the liquid is

A

B

C

D

Solution
Question 3
4 / -1

Two point light sources are 24 cm apart. Where should a convex lens of focal length 9 cm be put in between them from one source so that the images of both the sources are formed at the same place

A
6 cm

B
9 cm

C
12 cm

D
15 cm

Solution
Question 4
4 / -1

There is an equiconvex glass lens with radius of each face as R and _aμ_g = 3/2 and _aμ_w = 4/3. If there iswater in object space and air in image space, then the focal length is

A
2R

B
R

C
3 R/2

D
R²

Solution
Question 5
4 / -1

A prism having an apex angle 4° and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror

A
176°

B
4°

C
178°

D
2°

Solution
Question 6
4 / -1

An optical fibre consists of core of μ₁ surrounded by a cladding of μ₂<μ₁. A beam of light enters from air at an angle α with axis of fibre. The highest α for which ray can be travelled through fibre is

A

B

C

D

Solution
Question 7
4 / -1

A rod of glass (μ = 1.5) and of square cross section is bent into the shape shown in the figure. A parallel beam of light falls on the plane flat surface A as shown in the figure. If d is the width of a side and R is the radius of circular arc then for what maximum value ofd/Rlight entering the glass slab through surface A emerges from the glass through B

A
1.5

B
0.5

C
1.3

D
None of these

Solution
Question 8
4 / -1

The slab of a material of refractive index 2 shown in figure has curved surface APB of radius of curvature 10 cm and a plane surface CD. On the left of APB is air and on the right of CD is water with refractive indices as given in figure. An object Ois placed at a distance of 15 cm from pole P as shown. The distance of the final image of Ofrom P, as viewed from the left is

A
20 cm

B
30 cm

C
40 cm

D
50 cm

Solution
Question 9
4 / -1

A double convex lens, lens made of a material of refractive index μ₁, placed inside two liquids or refractive indices μ₂ and μ₃, as shown. μ₂>μ₁>μ₃. A wide, parallel beam of light is incident on the lens from the left. The lens will give rise to

A
A single convergent beam

B
Two different convergent beams

C
Two different divergent beams

D
A convergent and a divergent beam

Solution
Question 10
4 / -1

The distance between a convex lens and a plane mirror is 10 cm. The parallel rays incident on the convex lens after reflection from the mirror form image at the optical centre of the lens. Focal length of lens will be

A
10 cm

B
20 cm

C
30 cm

D
Cannot be determined

Solution