Ray Optics Test

Result

Ray Optics Test - 44

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Weekly Quiz Competition

Question 1
4 / -1

A convex lens made up of a material of refractive index n₁ is immersed in a medium of refractive index n₂ as shown in the figure. The relation between n₁ and n₂ is___________.

A

B
n₁ = n₂

C
n₁ < n₂

D
n₁ > n₂
Question 2
4 / -1

Two Plano – convex lenses of radius of curvature R and refractive index n = 1.5 will have equivalent focal length equal to R, when they are placed__________.

A
at distance R

B
at distance R/4

C
at distance R/2

D
in contact with each other
Question 3
4 / -1

A double convex lens made of glass of refractive index 1.6 has radius of curvature 15 cm each. The focal length of this lens when immersed in a fluid of refractive index 1.63 is____________.

A
– 40.75

B
– 407.5

C
– 125

D
– 12.5

Solution
Question 4
4 / -1

One ray of light suffers minimum deviation in an equilateral prism P additional prism Q and R of identical shown in figure. The ray will now suffer____________.

A
greater deviation

B
total internal reflection

C
same divination as before

D
no deviation
Question 5
4 / -1

Which of the following colours is scattered minimum ?

A
Violet

B
red

C
blue

D
yellow
Question 6
4 / -1

Angle of minimum devaition for a prism refractive index 1.5 is equal to the angle of the prism Then the angle of prism___________(given sin 48^o 36\' = 0.75)

A
62^o

B
82^o

C
60^o

D
41^o

Solution
Question 7
4 / -1

In a thin prism of glass (a_ng = 1.5) which of the following relation between the angle of minimum deviation δ_m and the angle of refraction r will be correct ?

A

B

C

D

Solution
Question 8
4 / -1

An observer look at a tree of height 10 meters away with a telescope of magnifying power 10. To him, the tree appears______________.

A
10 times taller

B
10 times smaler

C
10 times nearer

D
20 times nearer
Question 9
4 / -1

A normal person wants to see two pillars at a distant 11 km away separately. The distance between two pillars should be approximately_________.

A
1 m

B
3.2 m

C
0.5 m

D
1.6 m

Solution
Question 10
4 / -1

When the length of microscope tube increases, its magnifying power________.

A
decreases

B
increaes

C
does not change

D
none of these