A) A thin lens with focal length 10 cm is used to project the image of an object

Question

A) A thin lens with focal length 10 cm is used to project the image of an object placed 5 cm from it. The object is placed on the principal axis of the lens. The image produced will be which of the following: Virtual, Inverted, Projected onto a screen, upright, only visible by looking through the lens, real. B) Light travels across an interface between two media. The light leaves medium n1 and enters medium n2. The incident angle is ?. Total internal reflection occurs in n1 > or < n2? And Theta < or > sin-1 (n2/n1) C) Which of the following effects does NOT require the wave nature of light for an explanation? - Diffraction through a narrow slit, Image formation with a thin lens, Thin film interference, Bright spot formation from a diffraction grating.

Explanation / Answer

For any lens, if object is placed between lens and focal length, then a virtual, upright and only visible by looking through the lens lmage is produced

B) Total internal reflection when light travels from denser to rarer medium .

So n1>n2

and for theta > sin-1 (n2/n1).

C) image formation from a thin lens.

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