Ray Optics Test

Result

Ray Optics Test - 144

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

The impact of an image on the retina remains for

A
0.1s

B
0.5 s

C
10 s

D
15 s
Question 2
4 / -1

A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away?

A
Concave lens of 20 cm focal length

B
Convex lens of 20 cm focal length

C
Concave lens of 12 cm focal length

D
Convex lens of 12 cm focal length

Solution
Question 3
4 / -1

The sensation of vision in the retina is carried to the brain by

A
Ciliary muscles

B
Blind spot

C
Cylindrical lens

D
Optic nerve
Question 4
4 / -1

When the power of eye lens increases, the defect of vision is produced. The defect is known as

A
Shortsightedness

B
Longsightedness

C
Colourblindness

D
None of the above
Question 5
4 / -1

A man is suffering from colour blindness for green colour. To remove this defect, he should use goggles of

A
Green colour glasses

B
Red colour glasses

C
Smoky colour glasses

D
None of the above
Question 6
4 / -1

In human eye the focusing is done by

A
To and fro movement of eye lens

B
To and fro movement of the retina

C
Change in the convexity of the lens surface

D
Change in the refractive index of the eye fluids
Question 7
4 / -1

A short sighted person can see distinctly only those objects which lie between 10 cm and 100 cm from him. The power of the spectacle lens required to see a distant object is

A
+0.5 D

B
–1.0 D

C
–10 D

D
+4.0 D

Solution
Question 8
4 / -1

A person can see clearly only upto a distance of 25 cm. He wants to read a book placed at a distance of 50 cm. What kind of lens does he require for his spectacles and what must be its power?

A
Concave, – 1.0 D

B
Convex, + 1.5 D

C
Concave, – 2.0 D

D
Convex, + 2.0 D

Solution
Question 9
4 / -1

The human eye has a lens which has a

A
Soft portion at its centre

B
Hard surface

C
Varying refractive index

D
Constant refractive index
Question 10
4 / -1

A man with defective eyes cannot see distinctly object at the distance more than 60 cm from his eyes. The power of the lens to be used will be

A
+ 60 D

B
– 60 D

C
–1.66 D

D
1/1.66 D

Solution