alleryWhich is the principal use of a concave lens?
ACameras in the standard view
BSolar furnaces
CSpectacles for myopia
DBurning glass
Answer & Solution
Correct answer: C. Spectacles for myopia
1. Myopia is corrected by lenses with negative power.
2. Concave lenses have negative power and diverge incoming rays.
3. They effectively shift the far point back to infinity.
4. So myopia is corrected using concave spectacles.
5. The other uses listed need converging (convex) lenses.
_Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_
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