Ray Optics Test

Result

Ray Optics Test - 42

Score
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Weekly Quiz Competition

Question 1
4 / -1

what is the time taken in seconds to cross a glass plate of thickness 6 mm and μ = 2.0 by light ?

A
8 × 10^–11

B
4 × 10^–11

C
2 × 10¹¹

D
16 × 10^–11
Question 2
4 / -1

Which of the following diagrams shows correctly the dispersion of white light by a prism ?

A

B

C

D
Question 3
4 / -1

Assertion : Focal length of a lens for red colour is smaller than its focal length for violet colour
Reason : is because n_r > n_v

A
both assertion and reason are true and the reason is correct explanation of the assertion

B
both assertion and reason are true but reason do not explain the assertion

C
Assertion is true but the reason are false

D
both assertion and reason are false
Question 4
4 / -1

In which of the following cases a man will not see image grater than himself

A
convex mirror

B
concave mirror

C
plane mirror

D
none of these
Question 5
4 / -1

glass slab (n =1.5) of thickness 9 cm is placed over a written paper what is the Shift in the lattes ?

A
6 cm

B
3 cm

C
2 cm

D
0 cm

Solution
Question 6
4 / -1

A concave mirror of focal length 20 cm forms an virtual image having twice the linear dimensions of the object, the position of the object will be ___________cm

A
7.5

B
– 10

C
10

D
– 7.5
Question 7
4 / -1

In experiment to find focal length of a concave mirror a graph is drawn between the magnitude of u and v. The graph looks like___________.

A

B

C

D
Question 8
4 / -1

A mark at the bottom of the liquid appears to rise by 0.2 m, If depth of the liquid is 2.0 m then refractive index of the liquid is________________.

A
1.80

B
1.60

C
1.33

D
1.11

Solution
Question 9
4 / -1

1.6 is a refractive index of plano-convex lens, then the redius of curvature of the curved sunface is 60 cm. The focal length of the lens is_______ cm

A
50

B
100

C
– 50

D
– 100

Solution
Question 10
4 / -1

One convex lens and one concave lens placed is contect with each other. If the ratio of their power is 2/3 and focal length of the combination is 30 cm, then individual focal lengths are__________.

A
15 cm and –10 cm

B
–15 cm and 10 cm

C
30 cm and –20 cm

D
–30 cm and –30 cm

Solution