If we focus concave mirror to reflect sunlight towards a point on a paper such that the paper can burn, this point will be at :
a. Focus
b. F/2
c. C
d. Pole

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Solution

Dear student
the point must be focus because all the rays of light must converge at single point so that paper can burn (and all rays are also coming from infinity and tends to meet at focus).

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If we focus concave mirror to reflect sunlight towards a point on a paper such that the paper can burn, this point will be at : a. Focus b. F/2 c. C d. Pole

Dear student the point must be focus because all the rays of light must converge at single point so that paper can burn (and all rays are also coming from infinity and tends to meet at focus).

If we focus concave mirror to reflect sunlight towards a point on a paper such that the paper can burn, this point will be at :
a. Focus
b. F/2
c. C
d. Pole

Dear student
the point must be focus because all the rays of light must converge at single point so that paper can burn (and all rays are also coming from infinity and tends to meet at focus).