Ray Optics Test

Result

Ray Optics Test - 72

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Weekly Quiz Competition

Question 1
4 / -1

An object is placed 12 cm to the left of a converging lens of focal length 8 cm. Another converging lens of 6 cm focal length is placed at a distance of 30 cm to the right of the first lens. The second lens will produce

A
No image

B
A virtual enlarged image

C
A real enlarged image

D
A real smaller image

Solution
Question 2
4 / -1

The position of final image formed by the given lens combination from the third lens will be at a distance of f₁= + 10 cm, f₂ = – 10 m, f₃ = + 30 cm

A
15 cm

B
Infinity

C
45 cm

D
30 cm

Solution
Question 3
4 / -1

A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The imagewould be formed at

A
30 cm left

B
Infinity

C
1 cm to the right

D
18 cm to the left

Solution
Question 4
4 / -1

Two thin lenses of focal lengths f₁ and f₂ are in contact. The focal length of this combination is

A

B

C

D
Question 5
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
Question 6
4 / -1

If a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is

A
Violet

B
Red

C
The mean colour

D
All the colours together
Question 7
4 / -1

A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times its focal length should be

A
0.2 inch

B
0.8 inch

C
1.25 inch

D
5 inch

Solution
Question 8
4 / -1

An object placed 10 cm in front of a lens has an image 20 cm behind the lens. What is the power of the lens (in dioptres)

A
1.5

B
3.0

C
–15.0

D
+15.0

Solution
Question 9
4 / -1

A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of thelens will be

A
0.4 m

B
0.2 m

C
0.1 m

D
0.75m

Solution
Question 10
4 / -1

A point object is placed at the center of a glass sphere of radius 6 cm and refractive index 1.5. The distance of the virtual image from the surface of the sphere is

A
2 cm

B
4 cm

C
–6 cm

D
12 cm

Solution