You use a converging lens of focal length 15 cm to capture the real image of a d

Question

You use a converging lens of focal length 15 cm to capture the real image of a distant object on an index card. To get a sharp image, the distance between the card and the lens should be You have done experiments on water waves and on light waves. Destructive interference occurs when the path difference is half a wavelength for light waves and a full wavelength for water waves, half a wavelength for water waves and a full wavelength for light waves, half a wavelength for both light waves and water waves, a full wavelength for both light waves and water waves.

Explanation / Answer

6.) C , when object at contre of curvature the image will be formed at opposite side of the lens equal to the distance and size the of object.

7.)C, the two waves have a path difference of one-half a wavelength, a crest from one source will meet a trough from the other source. Destructive interference occurs for path differences of one-half a wavelength.

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