The figure below shows a trick in which a lighted candle can be made to appear to be burning in a glass of water.
figure
(a) What must be the distance of the lighted candle from the sheet of glass for this trick to work?
(b) What does the glass do to the light to get this effect?
(c) Which fact about a plane mirror is shown by this trick?

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Solution

(a) The distance of water glass from the glass sheet must be equal to the distance of lighted candle from the glass sheet.

(b) Here, though the glass is transparent, it acts as a mirror to get this effect.

(c) Reflection of light is shown here. Some light falling on the glass is reflected because transparent objects do reflect some light.

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Question 1

Observe the picture given in Fig. carefully.

A patch of light is obtained at B, when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light?

(a) A wooden board

(b) A glass sheet

(d) A sheet of white paper

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