Question

Assertion= A small source of light casts a sharp shadow of an opaque object.
Reason=Light travels in a straight line.
OPTIONS=
A] Both A and R are correct and R is correct explanation of A
B] Both A and R are correct and R is not correct explanation of A
C] A is true but R is false.
D] A is false but R is true .

Answer 1

Both A and R are correct and R is correct explanation of A. hence option (A) is correct.

Assertion : A small source of light casts a sharp shadow of an opaque object.

• Assertion is true, A shadow of an opaque object is cast by a small source of light. It is the dark region where light from source of light is blocked by an opaque object.
• Here, A small source of light casts a sharp shadow of an opaque object, It is because light travels in a straight line.

Reason : light travels in a straight line.

• Reason is true, Light travels in a straight line. But it can change its path (means, away from the straight line) when it is incident on an obstacle. This is known as diffraction of light.
• Reason is also correct explanation of assertion.

Therefore both A and R are correct and R is correct explanation of A.

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