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Physics Guru is an online education and competitive examinations preparation portal founded by Manish Verma, an IIT Madras alumnus, providing learning resources for competitive examinations.

The emphasis is on conceptual understanding, analytical thinking and problem solving rather than simply memorising formulas and standard methods.

The objective is to help students understand what they are learning and develop the ability to solve problems they have not seen before.

Photograph of Shadow

Photograph of Shadow

Well, actually the question was a bit different from, "Photograph of shadow" heading. It was asked by an eager mind from class 9th. The question was, "It is said that black hole does not reflect light. But, I have seen the mention of picture of black hole in a magazine. How is this possible?"

The answer is hidden in the "picture" of the shadow that can be seen in the photograph. Actually, it is not the photograph of the shadow that is taken but the light is blocked from certain portion and that is called shadow. The photograph is taken for the remaining portion and the place where the light is blocked is shadow.