ii. A lens of an optical instrument needs to form an inverted image that is 4 ti

Question

ii. A lens of an optical instrument needs to form an inverted image that is 4 times greater than the object. How far from the lens should the object be placed? (A) in front of the focal point of the lens. (B) Behind the focal point of the lens but not as far as the double focal point. (C) Behind the double focal point. (D) This image ill be formed regardless of the placement of the object. (E) This image will never be formed regardless of the placement of the object. monochromatic light ray in air (n = 1) enters a glass prism (n = 1.5). In the glass prism ... both the frequency and the wavelength are the same as in air the frequency is the same, but the wavelength is greater than in air. the frequency is the same, but the wavelength is smaller than in air. the wavelength is the same, but the frequency is greater than in air. the wavelength is the same, but the frequency is smaller than in air.

Explanation / Answer

12.

The frequency of the light does not change with medium, but the wavelength of the light changes.

So, the frequency is the same, but the wavelength is smaller than in air.

Note: n is inversely proportional to speed and is also inversely propotional wavelength.

Option (C) is correct.

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