Physics MCQs

Page No. 14

The value of critical angle for glass is_______________?


a42°


b47°


c52°


d50°


View Answer 42°

A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________?


acenter of curvature


bfocus


coptical center


daperture


View Answer focus

Dioptre power of an concave lens of 10 cm focal length is_______________?


a10 dioptre


b10 dioptre


c1 / 10 dioptre


d1 / 10 dioptre


View Answer 10 dioptre

The minimum distance between an object and its real image in a convex lens is_____________?


a2 f


b 2.5 f


c 3f


d 4f


View Answer 4f

A convex lens gives a virtual image only when the objects lies_________________?


abetween principal focus and center of curvature


b beyond 2 f


cat the principal focus


dbetween principal focus and optical center



Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?


a0.5


b 0.2


c1


d2


View Answer 2

Least distance of distinct vision_____________?


a increases with increase in age


bdecreases with increase in age


cneither increases nor decreases


dbecomes infinite after 60 years



Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?


azero


bfocus


c2 f


d f/2


View Answer f/2

For normal adjustment, length of astronomical telescope is______________?


afo + fe


b fo – fe


cfo / fe


d fe / fo


View Answer fo + fe

Final image produced by a compound microscope is_____________?


areal and inverted


breal and erect


cvirtual and erect


d virtual and inverted



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