physics set 10

Q.19 In Young’s Double Slit Experiment, slit separation x = 0.05 cm, distance between screen and
slit D = 200 cm, fringes separation x = 0.13 cm, then the wavelength ‘λ’ of light is:
A) λ = 1.23 x 10-2 m                              C) λ = 4.55 x 10-5 m
B) λ = 3.25 x 10-7 m                              D) λ = 5.1 x 10-7 m
Q.20 In normal adjustment of compound microscope, the eye piece is positioned so that the final
image is formed at:
A) Optical Center                                   C) Principle Focus
B) Infinity                                             D) Near Point

Q.21 The minimum distance from the eye at which an object appears to be distant is:
A) 25 cm                                               C) 35 cm
B) 22 cm                                               D) 20 cm
Q.22 Using the relation for the magnifying power Lo, M = 1 + d/f, if f = 5 cm and d = 25 cm then M will be:
A) 5                                          C) 6
B) 7                                          D) 8