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What is the difference between a lens and a mirror?
A mirror is a reflective surface. Light passes by the glass and hits the silver backing, reflecting off of it. (The angle of reflection equals the angle of incidence.)
A lens, on the other hand, does not reflect light; it refracts it. After entering the glass, light refracts in a different way depending on the shape of the lens and also makes a focal point where the refracting light comes to a point. This varies for different lenses -- convex or concave -- which is why there are dissimilar lenses for different types of eyeglasses.
What is Fresnel explanation of optical activity
Equivalence principle: The fundamental postulate of A. Einstein's general theory of relativity, that posits acceleration is indistinguishable fundamentally from a gravitationa
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A diode in a circuit similar to the one in Figure 29-26 has a voltage drop, V d , of 0.95 V when I = 18 mA. If a 390 Ω resistor, R, is connected in series, what power supply volta
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The wave nature of light is demonstrated by which of the following a) The photoelectric effect b) Colour c) The speed of light d) Diffraction Ans: The w
When a person stands on a scale in an elevator at rest, the scale reads 800 newtons. When the elevator is allowed to fall freely with acceleration of gravity, the scale reads o
what is expansion of solids
why do some substances react with each other while others don''t?
In a pure semiconductor, concentration of electrons in conduction band is equal to the concentration of holes in valence band. In the process of conduction when an electric field i
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