Ray Optics Test

Result

Ray Optics Test - 20

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Weekly Quiz Competition

Question 1
4 / -1

The refractive index of water, glass and diamond are 1.33, 1.50, 2.40 respectively. The refractive index of diamond relative to water and of glass relative to diamond, respectively are nearly

A
1.80, 0.625

B
0.554, 0.625

C
1.12, 1.8

D
0.554, 1.6
Question 2
4 / -1

A ray of light on the surface of a glass plate of thickness t. If the angle of incidence θ is small, the emerging ray would be displaced side ways by an amount
(take, n = refractive index of glass)

A
t θ n/(n + 1)

B
t θ (n – 1)/n

C
t θ n/(n – 1)

D
t θ (n + 1)/n
Question 3
4 / -1

A parallel beam of light is incident on a solid transparent sphere of a material of refractive index n. If a point image is produced at the back of the sphere, the refractive index of the material of sphere is

A
2.5

B
1.5

C
1.25

D
2.0
Question 4
4 / -1

The wavelength of a certain colour in air is 600 nm. What is the wavelength and speed of this colour in glass of refractive index 1.5 ?

A
500 nm and 2 × 10¹⁰ cms^-1

B
400 nm and 2 × 10⁸ cms^-1

C
300 nm and 3 × 10⁹ cms^-1

D
700 nm and 1.5 × 10⁹ cms^-1
Question 5
4 / -1

A wave has velocity u in medium P and velocity 2u in medium Q. If the wave is incident in medium P at an angle 30°, then the angle of refraction will be

A
30°

B
45°

C
60°

D
90°
Question 6
4 / -1

A fish, looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface of water, the radius of the circle in centimetre is

A

B

C

D
Question 7
4 / -1

A thin convex lens made from crown glass (μ = 3/2) has focal length f. When it is measured in two different liquids having refractive indices 4/3 and 5/3. lt has the focal lengths f₁ and f₂ , respectively. The correct relation between the focal length is

A
f₁ = f₂ < f

B
f₁ > f and f₂ becomes negative

C
f₂ > f and f₁ becomes negative

D
f₁ and f₂ both become negative.
Question 8
4 / -1

A point object is placed at a distance of 20 cm from a thin plano-convex lens of focal length 15 cm, if the plane surface is silvered. The image will form at

A
60 cm left of AB

B
30 cm left of AB

C
12 cm left of AB

D
60 cm right of AB
Question 9
4 / -1

A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then,

A
πr ² ∝ f

B
πr ² ∝ f ²

C
if lower half part is covered by black sheet, then area of the image is equal to are π²/2

D
if f is doubled, intensity will increase.
Question 10
4 / -1

Graph of position of image versus position of point object from a convex lens is shown. Then, focal length of the lens is

A
0.50 ± 0.05 cm

B
0.50 ± 0.10 cm

C
5.00 ± 0.05 cm

D
5.00 ± 0.1 0 cm