Refraction through a lens
ICSE · Class 10 · Physics
Flashcards for Refraction through a lens — ICSE Class 10 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allState the definition of a lens.
Answer
A lens is a transparent homogeneous refracting medium bounded by either two curved surfaces or one plane surface and one curved surface.
How is a convex lens identified by shape and action?
Answer
A convex lens is thicker in the middle and thinner at its periphery. It converges a beam of light, so it is also called a converging lens.
How is a concave lens identified by shape and action?
Answer
A concave lens is thinner in the middle and thicker at the periphery. It diverges a beam of light, so it is also called a diverging lens.
What is the difference between concavo-convex and convexo-concave lenses?
Answer
A concavo-convex lens has one convex and one concave surface and has converging nature. A convexo-concave lens has one convex and one concave surface and has diverging nature.
What is the optical centre of a lens?
Answer
The optical centre is the point through which a ray passes without any deviation, if the lens is thin.
Define first focal point F1 for a convex lens and a concave lens.
Answer
For a convex lens, F1 is the point from where a divergent beam becomes parallel after refraction. For a concave lens, F1 is the point at which a convergent beam appears to meet and then becomes parall…
Define second focal point F2 for a convex lens and a concave lens.
Answer
For a convex lens, F2 is the point where a parallel beam converges after refraction. For a concave lens, F2 is the point from which a parallel beam appears to diverge after refraction.
State the relation between first and second focal lengths when the medium on both sides of the lens is the same.
Answer
If the medium on both sides of the lens is same, then the first and second focal lengths are numerically equal: f1 = f2.
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