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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.
It is based on the photovoltaic effect. One of the semiconductor regions is made so thin that the light incident on it reaches the p-n junction and gets absorbed. It changes solar
In a movie, Tarzan evades his captors by hiding underwater for many minutes while breathing through a long , thin reed . Assuming the maximum pressure difference his lungs can mana
what is electric field
Temperature joule; J (after J.P. Joule, 1818-1889) The derived SI unit of energy described as the amount of work done by moving an object by a distance of 1 m by applying a fo
a) A uniform mild steel ring has a diameter of 50mm and a cross-sectional area of 1cm 2 . Determine the mmf essential to produce a flux of 50µWb in the ring. (b) I
What is the appropriate assignment for this particular topic?
Construction: A motor require essentially a rectangular coil called armature a permanent magnet, a device called commutator to reverse the direction of current and a source of ele
Regard as two charged particles. At a given separation each one particle exerts a force of 12 N on the other. What force does every one exert on the other after someone moves the p
Making an observation nest for ants An observation nest for the study of the life story of ants can simply be made as follows. Make a wooden U from three 30 cm lengths of w
Define the Intensity of the laser in short. Intensity: a. Lasers are intense and bright light sources. It is due to coherence and directionality. b. The intensity is e
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