Question

A teacher has asked you to draw the ray diagram of concave lens. What is your interpretation​

Answer 1

To draw a ray diagram of concave and convex lens both:-

Concave mirror- use the following laws

━☞ Any incident ray travelling parallel to principle axis on the way to the mirror will pass through the focal point upon reflection

━☞ Any incident ray passing through the focal point on the way to the mirror will travel parallel to the principle axis upon reflection.

━☞ A ray passing from the C (centre of curvature) reflects back (on same path).

Convex mirror- use the following laws

━☞ Any incident ray travelling parallel to principle axis on the way to a convex mirror will reflect in such a manner that its extension will pass through the focal point.

━☞Any incident ray travelling towards a convex mirror such that its extension passes through the focal point will reflect and travel parallel to the principle axis.

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