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The electric field intensity produced by the radiations coming from 100 W bulb at 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is:
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The optical length of an astronomical telescope with magnifying power of ten for normal vision is 44 cm. what is the focal length of the object
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The resolving power of a telescope whose lens has a diameter of 1.22 m for a wavelength of 5000° is
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A doctor advise a patient to are spectating with a convex len of focal length 40 cm in constant with ·a concave lens of focal length 25 cm. What is the power of the combination?
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Refractive index of material of a prism is `sqrt(2)`. The angle of prism is 60°, What is the angle of minimum deviations?
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If the refractive index of a material of equilateral prism is `sqrt(3)` then angle of minimum deviation of prism
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The focal length of a this lens in vacuum is f. If the material of the lens has µ = 3/2, its focal length when immersed in water refractive index 4/3 will
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A slit width a is illuminate by white light. The first minimum for red light (λ = 6500 A°) will fall at O = 30 when a will be
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