A parallel beam of sodium light of wavelength 5896 Å is incident at angle `30^(@)`. Find the minimum thickness of the glass plate for which the transmitted beam appears to be dark.
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White light is incident normally on a glass plate (in air) of thickness `500 nm` and refractive index of `1.5`. The wavelength (in `nm`) in the visibl
Correct Answer - B For strong reflection. `2mut=(lambda)/(2),(3lambda)/(2),(5lambda)/(2).....rArr lambda=4mut,(4mut)/(3),(4mut)/(5),(4mut)/(7).....` `rArr 3000 nm. 1000 nm, 600 nm, 333 nm.` `rArr` only option is `600 nm`.
2 Answers 1 views
A parallel beam of monochromatic light of frequency v is incident on a surface. Intensity of the beam is I and area of the surface is A. Find the forc
Correct Answer - (i) `(IA)/(c)` , (ii) `(2IA)/(c)` (iii) `(Iacostheta)/(c)` , (iv) `(2IAcos^(2)theta)/(c)`
2 Answers 1 views
A single ray traverses a glass plate (thickness = t) with plane surfaces that are parallel to each other. The emergent ray is parallel to the incident
Correct Answer - `d = t sin i[1-(cosi)/(sqrt(mu^(2)-sin^(2)i))]`
2 Answers 1 views
Between the plates of a parallel-plate capacitor there is a metallic plate whose thickness takes up `eta = 0.60` of the capacitor gap. When that plate
Correct Answer - (a)`-0.15mJ` (b) `0.15mJ`
2 Answers 1 views
When light of wavelength 400nm is incident on the cathode of photocell, the stopping potential recorded is 6V. If the wavelength of the incident light
Correct Answer - 4.97 V
2 Answers 7 views
White light is incident normally on a plane parallel thin film of µ=1.5. Find the minimum thickness of the film for which light of `lamda`=4000 Å is a
Correct Answer - `1.33xx10^(-7)`m
2 Answers 2 views
A beam of light travelling in water falls on a glass plate immersed in water. When the incident angle is `51^(@)`, the reflected beam of light is foun
Correct Answer - 1.647
2 Answers 1 views
The critical angle for a certain wavelength of light is glass is `40^(@)`. Calculate the polarising angle and the angle of refraction in glass corresp
Correct Answer - `57.3^(@),32.7^(@)`
2 Answers 1 views
A glass plate (n=1.53) that is 0.485 ` mu` m thick and surrounded by air is illuminated by a beam of white light normal to the plate. (a) What wavelen
Correct Answer - `[(a) 424 nm, 594 nm; (b) 495 nm]
2 Answers 1 views
A ray of light is incident on the glass prism at an angle of `40^(@)`. Find the angle of emergence, if the angle of prism is `60^(@)` and refractive i
Correct Answer - `58.5^(@)`
2 Answers 1 views