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Q.1: If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from——-?
- chromatic aberration
- spherical aberration
- both spherical and chromatic
Q.2: A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is——-?
- f2 + f1
- f2 – f1
Q.3: In multimode step index fibre the refractive index of core and cladding is——?
- different with refractive index of core higher than cladding
Q.4: Final image produced by a compound microscope is——-?
- real and inverted
- real and erect
- virtual and erect
- virtual and inverted
Q.5: For normal adjustment, length of astronomical telescope is——-?
- fo + fe
- fo – fe
- fo / fe
- fe / fo
Q.6: Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is——-?
- 2 f
Q.7: Least distance of distinct vision——-?
- increases with increase in age
- decreases with increase in age
- neither increases nor decreases
- becomes infinite after 60 years
Q.8: Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is———?
Q.9: A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called——-?
- center of curvature
- optical center
Q.10: The value of critical angle for glass is——–?