Ray Optics Test

Result

Ray Optics Test - 67

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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 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 or light is

A

B

C

D

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 f₂are

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

If the central portion of a convex lens is wrapped inblack paper as shown in the figure

A
No image will be formed by the remaining portion of the lens

B
The full image will be formed but it will be less bright

C
The central portion of the image will be missing

D
There will be two images each produced by one of the exposed portions of the lens
Question 5
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 0.25 m
Question 6
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 7
4 / -1

In the figure, an air lens of radii of curvature 10 cm (R₁ = R₂ = 10 cm) is cut in a cylinder of glass (μ = 1.5). The focal length and the nature of the lens is

A
15 cm, concave

B
15 cm, convex

C
∞ , neither concave nor convex

D
0, concave

Solution
Question 8
4 / -1

A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milliradian 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 9
4 / -1

The focal length of a simple convex lens used as a magnifier is 10 cm. For the image to be formed at a distance of distinct vision (D = 25 cm), the object must be placed away from the lens at a distance of

A
0.5 cm

B
7.14 cm

C
7.20 cm

D
16.16 cm

Solution
Question 10
4 / -1

A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R.Its focal length is

A

B
R

C
2R

D
1.5 R

Solution