Ray Optics Test

Result

Ray Optics Test - 39

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Weekly Quiz Competition

Question 1
4 / -1

A lens is placed between a source of light and a wall. It forms images of area A₁ and A₂ on the wall, for its two different positions. The area of the source obtained is

A

B

C

D

Solution
Question 2
4 / -1

A plane mirror produces a magnification of

A
– 1

B
+ 1

C
zero

D
between 0 and + ∞

Solution
Question 3
4 / -1

The astronomical telescope consists of objective and eye-piece. The focal length of the objective is

A
equal to that of the eye piece

B
greater than that of eye piece

C
shorter than that of eye piece

D
five times shorter than that of the eye piece
Question 4
4 / -1

An air bubble in a glass slab (µ = 1.5) is 5 cm deep when viewed from one face and 2 cm deep when viewed from the opposite face. The thickness of the slab is

A
10.5 cm

B
7 cm

C
10 cm

D
7.5 cm

Solution
Question 5
4 / -1

A convex lens has a focal length f. It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be

A
f/2

B
f

C
3/2 f

D
2f

Solution
Question 6
4 / -1

A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and of the same material as P are now added as shown in Fig. The ray will now suffer

A
greater deviation

B
no deviation

C
same deviation as before

D
total internal reflection
Question 7
4 / -1

Critical angle for light going from medium (i) to (ii) is Ө. The speed of light in medium (i) is u. Then speed in medium (ii) is

A
u (1 – cos Ө)

B
u/sin Ө

C
u/cos Ө

D
u(1– sin Ө)

Solution
Question 8
4 / -1

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface, the radius of this circle in cm is

A

B

C

D

Solution
Question 9
4 / -1

A concave lens is in contact with convex lens. The ratio of the magnitude of their power is 2/3. Their equivalent focal length is 30 cm. What are their individual focal lengths in cm?

A
–75, 50

B
– 10, 15

C
75, 50

D
– 15, 10

Solution
Question 10
4 / -1

A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 m tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens

A
5 cm

B
10 cm

C
1 cm

D
2 cm

Solution