Related InterviewSolutions

• When an unpolarised light of inensity `I_0` is incident on a polarizing sheet, the intensity of the light which does not get transmittted isA. `I_0`B. ZeroC. `(1)/(4)I_0`D. `(1)/(2)I_0`
• What is the shape of the wavefront in each of the following cases ? (a) light diverging from point source. (b) light emerging out of a convex lens when a point source is placed at its focus. ( c) the portion of the wavefront of light from a distant star intercepted by earth.A. Cylindrical wavefrontB. Plane wavefrontC. Converging wavefrontD. Diverging wavefront
• When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height 7 cm. If refractive index of glass is `1.5`, then refractive index of water isA. `1.258`B. `1.269`C. `1.286`D. `1.310`
• When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height 7 cm. If refractive index of glass is `1.5`, then refractive index of water isA. `1.25`B. `1.5`C. `1.33`D. `1.75`
• The periodic time of rotation of a certain star is 22 days and its radius is `7 xx 10^(8)` metres . If the wavelength of light emitted by its surface be `4320 Å`, the Doppler shift will be (1 day = 86400 sec )A. 0.33ÅB. 0.33ÅC. 3.3ÅD. 33Å
• The `6000Å` line emitted by a gaseous element in a star iis found to have red shift of ` 15Å`. What is the speed with which the star is receding from the earth ? `(c=3 xx 10^(8) m//s )`A. `5xx10^(5) m//s `B. `6xx10^(5) m//s `C. `7.5xx10^(5) m//s `D. `9xx10^(5) m//s `
• A light is travelling from air a medium the velocity of light in a medium is reduced to to 0.75 times the velocity n air assume that angle of incidence I is very small the deviation of the ray isA. `delta=i`B. `delta=(i)/2`C. `delta=(i)/4`D. `delta=2r `
• The wave number of two waves are ` 2.5 xx 10^(6)`/ metre and ` 2 xx 10^(6)`/metre. What is the difference between their wavelengths ?A. `5000Å`B. `4000Å`C. `2000Å`D. `1000Å`
• A strone thrown into still water, creates a circular wave pattern moving radially outwards. If r is the distance measured from the centre of the pattern. The amplitudeof the aves varies asA. `r^(-1//2)`B. `r^(-1) `C. `r^(-2)`D. `r^(-3//2 )`
• The difference in speeds of a rya of light in galss and wate is ` 2.5 xx 10^(7) m//s `. If the R.I. of glass and water are `(3)/2 and (4)/3` respectively, then the velocity of light in air isA. a) `2 xx 10^(8) m//s `B. b) `2.25 xx 10^(8) m//s `C. c) `3 xx 10^(8) m//s `D. d) `2.5 xx 10^(8) m//s `