Ray Optics Test

Result

Ray Optics Test - 73

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Weekly Quiz Competition

Question 1
4 / -1

A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens an object be placed in order to have a real image of the size of theobject

A
20 cm

B
30 cm

C
60 cm

D
80 cm

Solution
Question 2
4 / -1

The focal lengths for violet, green and red light rays are f_V, f_G and f_R respectively. Which of the following isthe true relationship

A
f_RGV

B
f_V< f_G< f_R

C
f_G< f_R< f_V

D
f_G< f_V< f_R

Solution
Question 3
4 / -1

The power of an achromatic convergent lens of two lenses is + 2D. The power of convex lens is + 5D. The ratio of dispersive power of convex and concave lenswill be

A
5 : 3

B
3 : 5

C
2 : 5

D
5 : 2

Solution
Question 4
4 / -1

A combination of two thin convex lenses of focal length 0.3 m and 0.1 m will have minimum spherical and chromatic aberrations if the distance between them is

A
0.1 m

B
0.2 m

C
0.3 m

D
0.4 m

Solution
Question 5
4 / -1

A bi-convex lens made of glass (refractive index 1.5) is put in a liquid of refractive index 1.7. Its focal lengthwill

A
Decrease and change sign

B
Increase and change sign

C
Decrease and remain of the same sign

D
Increase and remain of the same sign

Solution
Question 6
4 / -1

Spherical aberration in a lens

A
Is minimum when most of the deviation is at the first surface

B
Is minimum when most of the deviation is at the second surface

C
Is minimum when the total deviation is equally distributed over the two surface

D
Does not depend on the above consideration
Question 7
4 / -1

The focal lengths of convex lens for red and blue light are 100 cm and 96.8 cm respectively. The dispersivepower of material of lens is

A
0.325

B
0.0325

C
0.98

D
0.968

Solution
Question 8
4 / -1

A point object Ois kept at a distance of OP = u. The radius of curvature of the spherical surface APB is CP = R. The refractive index of the media are n₁ and n₂ which are as shown in the diagram. Then,
(1) If n₁> n₂, image is virtual for all values of u.
(2) If n₂ = 2n₁,image is virtual when R > u.
(3) The image is real for all values of u, n₁ and n₂.
Here, the correct statement/s is/are

A
Only (2)

B
Both (1) and (2)

C
Only (1)

D
(1), (2) and (3)
Question 9
4 / -1

The focal length of a plano-convex lens is f and its refractive index is 1.5. It is kept over a plane glass plate with its curved surface touching the glass plate. The gap between the lens and the glass plate is filled by a liquid. As a result, the effective focal length of the combination becomes 2f. Then, the refractive index ofthe liquid is

A
1.5

B
2

C
1.25

D
1.33

Solution
Question 10
4 / -1

A square card of side length 1 mm is being seen through a magnifying lens of focal length 10 cm. The card is placed at a distance of 9 cm from the lens. The apparent area of the card through the lens is

A
1 cm²

B
0.81 cm²

C
0.27 cm²

D
0.60 cm²

Solution