- (A) center of curvature
- (B) focus
- (C) optical center
- (D) aperture
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- (A) 10 dioptre
- (B) 10 dioptre
- (C) 1 / 10 dioptre
- (D) 1 / 10 dioptre
- (A) 2 f
- (B) 2.5 f
- (C) 3f
- (D) 4f
- (A) between principal focus and center of curvature
- (B) beyond 2 f
- (C) at the principal focus
- (D) between principal focus and optical center
- (A) 0.5
- (B) 0.2
- (C) 1
- (D) 2
- (A) of unknown nature
- (B) high energy electrons
- (C) high energy photons
- (D) radio isotopes
- (A) its energy levels are too close to each other
- (B) its energy levels are too far apart
- (C) it is too small in size
- (D) it has a single electron
- (A) 10-10s
- (B) 10-8s
- (C) 10-6s
- (D) 10-9s
- (A) Balmer series
- (B) Pfund series
- (C) Bracket series
- (D) Lymann series
- (A) 18.336
- (B) 1836
- (C) 18360
- (D) 183.6
