Which statement is true regarding images produced from mirrors? (a) Convex mirro

Question

Which statement is true regarding images produced from mirrors? (a) Convex mirrors always produce virtual images. (b) A virtual image always appears to be behind the mirror, while a real image always appears in front of the mirror. (c) Any real image can be projected onto a screen, whereas a virtual image cannot. (d) The light must enter perpendicular to the surface. In order for light to pass through a system of polarizers, what is required? (a) The initial light must be unpolarized. (b) No two adjacent polarizers can have perpendicular polarization axes. (c) The angle between the first and last polarizers must be less than 90 degree. (d) No conditions are needed, some light will pass through any number of polarizer

Explanation / Answer

1) (a) Convex mirrors always produce virtual image.

Formation of image by convex mirror is:

At infinity image formed at F, Virtual, zero size

between infinity and C ; between F and V ; Virtual upright and diminished image

at V ; at V ; Virtual, upright same sized.

2)(b)No two adjacent polarizers can have perpendicular axes.

Since, when perpendicular, theta = 90 deg

So the resulting intensity will be zero because,

I = I0 cos^2(theta) = 0

Hence, axes of adjacent polarizers should not be perpendicular.

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