Ray Optics Test

Result

Ray Optics Test - 145

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Weekly Quiz Competition

Question 1
4 / -1

A person\'s near point is 50 cm and his far point is 3 m. Power of the lenses he requires for (i) reading and (ii) for seeing distant stars are

A
–2 D and 0.33 D

B
2 D and –0.33 D

C
–2 D and 3 D

D
2 D and –3 D

Solution
Question 2
4 / -1

A satisfactory photographic print is obtained when the exposure time is 10 s at a distance of 2 m from a 60 cd lamp. The time of exposure required for the same quality print at a distance of 4 m from a 120 cd lamp is

A
5 s

B
10 s

C
15 s

D
20 s

Solution
Question 3
4 / -1

Myopia is due to

A
Elongation of eye ball

B
Irregular change in focal length

C
Shortening of eye ball

D
Older age
Question 4
4 / -1

A person is suffering from the defect astigmatism. Its main reason is

A
Distance of the eye lens from retina is increased

B
Distance of the eye lens from retina is decreased

C
The cornea is not spherical

D
Power of accommodation of the eye is decreased
Question 5
4 / -1

A person cannot see objects clearly beyond 2.0 m. The power of lens required to correct his vision will be

A
+2.0 D

B
–1.0 D

C
+ 1.0 D

D
–0.5 D

Solution
Question 6
4 / -1

The resolving limit of healthy eye is about

A

B

C

D
Question 7
4 / -1

When objects at different distances are seen by the eye, which of the following remains constant

A
The focal length of the eye lens

B
The object distance from the eye lens

C
The radii of curvature of the eye lens

D
The image distance from the eye lens
Question 8
4 / -1

A person wears glasses of power – 2.0 D. The defect of the eye and the far point of the person without the glasses will be

A
Nearsighted, 50 cm

B
Farsighted, 50 cm

C
Nearsighted, 250 cm

D
Astigmatism, 50 cm

Solution
Question 9
4 / -1

An eye specialist prescribes spectacles having a combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in dioptres is

A
+ 1.5

B
–1.5

C
+6.67

D
–6.67

Solution
Question 10
4 / -1

Match the List I with the List II from the combinations shown

A
I–A; II–C; III–B; IV–D

B
I–B; II–D; III–C; N–A

C
I–D; II–B; III–A; N–C

D
I–D; II–A; III–C; N–B