CBSE Class 10 Science 2019 · Paper 31/1/1/C · Question 27(a)

Light - Reflection and Refraction 2 marks Medium

Out of the five incident rays shown in the following diagram, find any two incident rays that are obeying the laws of refraction of light and may be used for locating the position of the image formed by a convex lens. Use these two rays in finding the position, size and nature of the image formed when an object is placed between

F_{1}

and

2 F_{1}

of a convex lens.

Answer

Rays 2 and 3 (any two of 2, 3, 4) obey the laws; the image is beyond $2 F_{2}$ , real, inverted and enlarged.

Any two of rays 2, 3 and 4 (for example, rays 2 and 3). Ray 2 is parallel to the principal axis and after refraction passes through the principal focus

F_{2}

; ray 3 passes through the optical centre

O

without deviation; ray 4 passes through the principal focus

F_{1}

and emerges parallel to the principal axis. Rays 1 and 5 do not follow these rules. For an object placed between

F_{1}

and

2 F_{1}

, these rays meet on the other side of the lens beyond

2 F_{2}

. Position of the image: beyond

2 F_{2}

; size: enlarged (larger than the object); nature: real and inverted.

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CBSE Class 10 Science 2019 · Paper 31/1/1/C · Question 27(a)

Answer

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