A child while playing with his father's spectacles burnt a hole in a p

1.	A child while playing with his father's spectacles burnt a hole in a piece of paper by focusing asmall image of the sun on it.(i) What defect of vision his father is suffering from?(ii) Write two causes for this defect?6.Path+1+1]Draw a ray diagram to show image formation by the defective eye?nraw a ray diagram showing corrected eye using properilens.
Answer» Convex lens is also called as converging lens as it can converge the refracted rays at one point on principal axis called Focus .It's clear that child used spectacles having convex lens to burn paper as it focused Sunrays at a point. (1)Child's father is suffer with hypermetropia where he can see far things clearly and finds difficulty in seeing near things Corrective measures used for eyedefect: Doctor suggest convex lens spectacles. (2)Due to increased in focal length and decrease in eye ball (3) and (4)

A child while playing with his father's spectacles burnt a hole in a piece of paper by focusing asmall image of the sun on it.(i) What defect of vision his father is suffering from?(ii) Write two causes for this defect?6.Path+1+1]Draw a ray diagram to show image formation by the defective eye?nraw a ray diagram showing corrected eye using properilens.

Answer»

Convex lens is also called as converging lens as it can converge the refracted rays at one point on principal axis called Focus .It's clear that child used spectacles having convex lens to burn paper as it focused Sunrays at a point.

(1)Child's father is suffer with hypermetropia where he can see far things clearly and finds difficulty in seeing near things Corrective measures used for eyedefect: Doctor suggest convex lens spectacles.

(2)Due to increased in focal length and decrease in eye ball

(3) and (4)

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