Ray Optics Test

Result

Ray Optics Test - 21

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Weekly Quiz Competition

Question 1
4 / -1

A luminous object is separated from a screen by distance d. A convex lens is placed between the object and the screen such that it forms a distinct image on the screen. The maximum possible focal length of this convex lens is

A
4d

B
2d

C
d / 2

D
d / 4
Question 2
4 / -1

Figure shows an object AB placed in front of two thin coaxial lenses 1 and 2 with focal lengths 24 cm and 9.0 cm, respectively. The object is 6.0 cm, from the lens I and the lens separation is L=10 cm. Where does the system of two lenses produce an image of the object AB ?

A
+ 18 cm

B
– 18 cm

C
+ 24 cm

D
– 24 cm
Question 3
4 / -1

A convex lens has its radii of curvature equal. The focal length of the lens is f. If it is divided vertically into two identical plano-convex lenses by cutting it, then the focal length of the plano-convex lens is (μ = the refractive index of the material of the lens)

A
f

B
f / 2

C
2 f

D
( μ–1 ) f
Question 4
4 / -1

A thin converging lens of focal length f = 25 cm forms the image of an object on a screen placed at a distance of 75 cm from the lens. The screen is moved closer to the lens by a distance of 25 cm. The distance through which the object has to be shifted, so that its image on the screen in sharp again is

A
37.5 cm

B
16.25 cm

C
12.5 cm

D
13.5 cm
Question 5
4 / -1

A double convex lens of glass of refraction index µ is immersed in a medium of refractive index µ₁ . If a parallel beam emerges undeviated through the lens, then

A
µ = µ₁

B

C
µ > µ₁

D
µ < µ₁
Question 6
4 / -1

Light form a point source in air falls on a spherical glass surface (n = 1.67 and radius of curvature = 25 cm). The distance of the light source from the glass surface is 95 cm. At what position, the image is formed?

A
75.45 cm

B
90.50 cm

C
105.25 cm

D
99.40 cm
Question 7
4 / -1

The image of an object, formed by a plano-convex lens at a distance of 8 m behind the lens, is real and in one-third the size of the object. The wavelength of light inside the lens is 2/3 times the wavelength in free space. The radius of the curved surface of the lens is

A
1 m

B
2 m

C
3 m

D
6 m

Solution
Question 8
4 / -1

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

A
15 cm

B
20 cm

C
30 cm

D
10 cm
Question 9
4 / -1

The graph between angle of deviation (δ) and angle of incidence (i) for a triangular prism is represented by

A

B

C

D

Solution
Question 10
4 / -1

The plane faces of two identical plano-convex lenses each having a focal length of 50 cm are placed against each ether to form a usual biconvex lens. The distance from this lens combination at which an object must be placed to obtain a real, inverted image which has the same size as the object is

A
50 cm

B
25 cm

C
100 cm

D
40 cm