1) A concave mirror with a focal length of 40 cm has 2 cm tall object placed 35

Question

1) A concave mirror with a focal length of 40 cm has 2 cm tall object placed 35 cm in front of it, the image formed is?

A) real and inverted

B) real and upright

C) vartual and inverted

D) vartual and upright

2) to find an image by ray tracing requires

A) only one ray

B) two rays

C) three rays

D) four rays

3) If in a single diffraction experiment the slit width is increased, which of the following happens to the diffraction pattern?

A) the central maximum broadens

B) the minima get closer together

C) eventually you get double slit interference

D) none of the above

Note:

please explain how you came up with the answers

Explanation / Answer

here,

1)

focal length , f = 40 cm

object distance , d = 35 cm

let the image distance be di

1/f = 1/di + 1/do

1/40 = 1/35 + 1/di

di = - 280 cm

as the object is placed between focal point and the mirror

therefore the image is virtual and upright

2)

to finad an image by tracing requires minimum B) two rays

3)

width of the minima = wavelength * D/d

d is slit width

when d is increased

B)

the minima get closer together

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