Mock Test

Optics part (2)

by mocktest
Updated On:

Total Questions: 45

41. What type of lens is used in magnifying glass? [67th B.P.S.C. (Pre) (Re. Exam) 2022]

Correct Answer: (c) Convex lens
Solution:convex lenses are used in magnifying devices due to their magnifying properties.A convex lens has the capacity to make an object appear much larger than its actually is here it is used in the magnifying glass is used to enlarge items such as writing so it can read more easily.

42. To remove the defect of long sightedness one uses [67th B.P.S.C. (PRE) 1999, Chhattisgarh P.C.S.(PRE) 2016]

Correct Answer: (c) convex lens
Solution:Far-sightedness (hypermetropia) as it is medically termed is a vision condition in which distant object are usually seen clear but near object are not clearly visible .To remove this vision problem one should use a convex lens.

43. Which one of the following statement is not true for a person suffering from the hypermetropia ? [U.P.P.C.S.(pre) 2010]

Correct Answer: (d) a concave lens is used to correct this defect
Solution:Far-sightedness (hypermetropia) is a common vision problem affecting about the forth of the population people with the hypermetropia can see distant objects that are close.

This vision problem occurs when the light rays entering the eye focused behind the retina rather then the directly on it.The eyeball of a farsighted person is shorter than the normal a convex lens is used to correct this detect.

44. Reading glasses are made from the which type of lenses? [44th B.P.S.C. (PRE) 2000]

Correct Answer: (b) convex
Solution:Convex lenses are thicker in the middle and converge incoming light rays. When reading, the light rays coming from the close-up text need to be bent more strongly to focus correctly on the retina.

Convex lenses provide this additional converging power, bringing the focal point forward onto the retina and resulting in a clear image and it also used to remove the defect of far-sightedness.

45. Which of the following lens is used to minimize myopia ? [U.P.P.C.S.(MAINS) 2011, M.P.P.C.S.(PRE) 2008]

Correct Answer: (b) concave lens
Solution:A concave lens is used to minimize the defect of myopia.

mocktest

Related Articles

CHEMISTRY (Part-V) (Railway)

Defence Technology Part-1

Space Part-4

Space Part-3

Space Part-2

Space Part-1

Leave a Comment