Suppose that you're facing a straight current-carrying conductor, and the current is flowing toward you. The lines of magnetic f
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Answer: The focal length of the lens = 3.32 cm.
Explanation:
Lens formula : (i)
f= focal length , v=image distance , u =object distance.
magnification: m = (ii )
Given: v= -12.8 cm , m =2.85
Put values in (ii), we get
substitute values of u , v in (i)
Hence, the focal length of the lens = 3.32 cm.
Answer:
Approximately .
Explanation:
The refractive index of the air is approximately
.
Let denote the refractive index of the glass block, and let
denote the angle of refraction in the glass. Let
denote the angle at which the light enters the glass block from the air.
By Snell's Law:
.
Rearrange the Snell's Law equation to obtain:
.
Hence:
.
In other words, the angle of refraction in the glass would be approximately .