On a hot summer day in a desert the refractive index of the atmosphere changes with height (y) above the surface of the earth as `mu = m_(0) (1 + by)^(1//2)` where `m_(0)` is the refractive index at the surface and `b = 6 ×x 10^(-4) m^(-1)`. A man of height 1.5 m is standing on a straight level road. Calculate the distance beyond which he cannot see a point on the road.
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A person staying in Sahara Desert and a person staying in Arabian Desert belong to the same biome or ecosystem?
Yes, the person staying in Sahara Desert and a person staying in Arabian desert belong to the same biome or ecosystem, since climatic conditions are same. But there may be...
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Refractive index of glass for red and violet colours are 1.50 and 1.60, repectively. Find: a. The refractive index for yellow colour, approximately b.
(a) `mu_(Y) = (mu_(Y) + mu_(R))/(2) = (1.50+ 1.60)/(2) = 1.55` (b) `omega = (mu_(Y) + mu_(R))/(mu_(y) - 1) = (1.60+ 1.50)/(1.55 - 1) = 0.18`
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A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is (refractive index of water `=1.33`)
Correct Answer - D Lens changes its behaviour if `R`.`I`. Of surrounding becomes greater than `R`.`I`. Of lens. `mu_("lens")lt1.33`
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A biconcave lens made of transparent material of refractive index `1.25` is immersed in water of refractive index `1.33`. Will the lens behave as a co
`(1)/(f)=((mu_(i))/(mu_(s))-1) [(1)/(R_(1))-(1)/(R_(2))]` For concave lens `[(1)/(R_(1))-(1)/(R_(2))]=-ve` here `=1.25` `s=1.32` Then `((mu_(i))/(mu_(s))-1)=-ve` Then `(1)/(f)rarr(-ve)(-ve)` Thus it will behave like converging lens.
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Water rises to a height `h` in a capillary at the surface of earth. On the surface of the moon the height of water column in the same capillary will b
Correct Answer - A `h=(2T cos theta)/(rdg) " "therefore h prop (1)/(g) " "["If other quantities remains constant"]` `(h_("moon"))/(h_("earth")) = (g_("earth"))/(g_("moon")) = 6 implies h_("moon") = 6h " "["As " g_("earth")=6g_("moon")]`
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July 11 is observed as (A) World environment day (B) World health day (C) World population day (D) No tobacco day
Correct option is: (C) World population day
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A Soap bubble has a thickness of 90 nm and its refractive index is `mu" = 1.4"`. What colour does the bubble appear to be at a point on its surface cl
Correct Answer - green
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Assume that clouds are distributed around the entire earth at a height of `3000 m` above the ground. The atmosphere can be modeled as a spherical capa
Correct Answer - (a) `199 Omega` (b) `3 xx 10^(5)V` (c) `165.3 s`
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The atmosphere of earth extends upto height H and its refractive index varies with depth y from the top as `mu = 1 + (y)/(H)` . Calculate the apparent
Correct Answer - Hln2
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A convex lens of refractive index 1.5 is immersed in a liquid of refractive index (i) 1.6 (ii) 1.3 and (iii) 1.5. what changes happens to the focal le
Correct Answer - (i) - 8f (ii) `+3.25f` (iii) `oo`
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