Ray Optics Test

Result

Ray Optics Test - 127

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Focal length of a convex lens will be maximum for

A
Blue light

B
Yellow light

C
Green light

D
Red light

Solution
Question 2
4 / -1

A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the Sun is 1.39 × 10⁹ m and its means distance from the earth is 1.5 × 10¹¹ m. What is the diameter of the Sun\'s image on the paper?

A
6.5 × 10^–5 m

B
12.4 × 10^–4 m

C
9.26 × 10^–4 m

D
6.5 × 10^–4 m

Solution
Question 3
4 / -1

A combination of two thin lenses with focal lengths f₁ and f₂ respectively forms an image of distant object at distance 60 cm when lenses are in contact. The position of this image shifts by 30 cm towards the combination when two lenses are separated by 10 cm. The corresponding values of f₁ and f₂ are

A
30 cm, –60 cm

B
20 cm, –30 cm

C
15 cm, –20 cm

D
12 cm, –15 cm

Solution
Question 4
4 / -1

An achromatic combination of lenses is formed by joining

A
2 convex lenses

B
2 concave lenses

C
1 convex lens and 1 concave lens

D
Convex lens and plane mirror

Solution
Question 5
4 / -1

A plano convex lens (f = 20 cm) is silvered at plane surface. Now f will be

A
20 cm

B
40 cm

C
30 cm

D
10 cm

Solution
Question 6
4 / -1

A diminished image of an object is to be obtained on a screen 1.0 m from it. This can be achieved by appropriately placing

A
A convex mirror of suitable focal length

B
A concave mirror of suitable focal length

C
A concave lens of suitable focal length

D
A convex lens of suitable focal length less than 0.25m
Question 7
4 / -1

The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is

A
150 cm

B
60 cm

C
30 cm

D
40 cm

Solution
Question 8
4 / -1

A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black, the image will

A
Be shifted downwards

B
Be shifted upwards

C
Not be shifted

D
Shift on the principal axis
Question 9
4 / -1

A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milli radian at the lens. What is the size of the image?

A
5 mm

B
1 mm

C
0.5 mm

D
0.1 mm

Solution
Question 10
4 / -1

Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial. The combination is equivalent to a singlelens of power

A

B

C

D

Solution