Ray Optics Test

Result

Ray Optics Test - 130

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Weekly Quiz Competition

Question 1
4 / -1

Figure given below shows a beam of light converging at point P. When a concave lens of focal length 16 cm is introduced in the path of the beam at a place O shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance x from the lens. The value x will be equal to

A
12 cm

B
24 cm

C
36 cm

D
48 cm

Solution
Question 2
4 / -1

When light rays from the sun fall on a convex lens alonga direction parallel to its axis

A
Focal length for all colours is the same

B
Focal length for violet colour is the shortest

C
Focal length for yellow colour is the longest

D
Focal length for red colour is the shortest
Question 3
4 / -1

A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed are

A
1

B
5

C
4

D
3
Question 4
4 / -1

The dispersive power of the material of lens of focallength 20 cm is 0.08. The longitudinal chromatic aberration of the lens is

A
0.08 cm

B
0.08/20 cm

C
1.6 cm

D
0.16 cm

Solution
Question 5
4 / -1

A convex lens is dipped in a liquid whose refractiveindex is equal to the refractive index of the lens. Then its focal length will

A
Become infinite

B
Become small, but non-zero

C
Remain unchanged

D
Become zero
Question 6
4 / -1

The sun makes 0.5° angle on earth surface. Its image ismade by convex lens of 50 cm focal length. The diameter of the image will be

A
5 mm

B
4.36 mm

C
7 mm

D
None of these

Solution
Question 7
4 / -1

The chromatic aberration in lenses becomes due to

A
Dissimilarity of main axis of rays

B
Dissimilarity of radii of curvature

C
Variation of focal length of lenses with wavelength

D
None of the above

Solution
Question 8
4 / -1

If aperture of lens is halved then image will be

A
No effect on size

B
Intensity of image decreases

C
Both (a) and (b)

D
None of the above

Solution
Question 9
4 / -1

When the convergent nature of a convex lens will beless as compared with air

A
In water

B
In oil

C
In both (a) and (b)

D
None of these
Question 10
4 / -1

An achromatic combination of lenses produces

A
Coloured images

B
Highly enlarged image

C
Images in black and white

D
Images unaffected by variation of refractive index with wavelength

Solution