A lens if placed between a source of light and a wall. It forms images of area` A_(1)` and `A_(2)` on the wall for its two different positions. The area of the source or light isA. `sqrt(A_(1)A_(2))`B. `(A_(1)+A_(2))/2`C. `(A_(1)-A_(2))/2`D. `(1)/A_(1)+(1)/A_(2)`

A lens if placed between a source of light and a wall. It forms images

1.	A lens if placed between a source of light and a wall. It forms images of area` A_(1)` and `A_(2)` on the wall for its two different positions. The area of the source or light isA. `sqrt(A_(1)A_(2))`B. `(A_(1)+A_(2))/2`C. `(A_(1)-A_(2))/2`D. `(1)/A_(1)+(1)/A_(2)`
Answer» Correct Answer - A

Discussion

No Comment Found

Related InterviewSolutions

A ray of light travelling in a transparent medium f refractive index `mu`, falls on a surface separating the medium from air at an angle of incidence of `45^(@)`. For which of the following value of `mu` the ray can undergo total internal reflection ?A. `mu=1.33`B. `mu = 1.40`C. `mu = 1.50`D. `mu = 1.25`
A luminous object is placed at a distance of 30 cm. from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens, a convex mirror of radius of curvture 10 cm. be polaced in order to have an upright image of the object coincident with it ?A. 12 cmB. 30 cmC. 50 cmD. 60 cm
Light enters at an angle of incidance in a tranjsparent road of refractve index `mu.` for what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateral face whatsoever be the value of angle of incidance ?A. `mugtsqrt2`B. `mu=1`C. `mu=1.1`D. `mu=1.3`
Light travels through a glass plate of thickness t and refractive index `mu.` If c is the speed of light in vacuum, the time taken by light to travel this thickness of glass isA. `mutc`B. `(tc)/mu`C. `(1)/(mut)`D. `(mut)/c`
The ration of resolving powers of an optical microscope for two wavelangths `lamda_(1) =4000` `Å and lamda_(2)=6000 Å is`A. `8:27`B. `9:4`C. `3:2`D. `16:81`
Ray optics is valid, when characteristic dimensions areA. of the same order as the wavelength of lightB. much smaller than wavelength of lightC. of thr order of one millimeterD. much large than the waveiength of light
The wavelength of light of frequenceA. `2xx10^(6)m`B. `3xx10^(6)m`C. `4xx10^(6)m`D. `5xx10^(6)m`
Rainbows are formed byA. reflection and diffractionB. refraction and scatteringC. dispersion and total internal reflectionD. interference only
A man is 6 ft tall In order to see his entire image, he requires a plane mirror of minimum length equal toA. `6 ft`B. `12 ft`C. `2 ft`D. `3ft`
The angular resolution of a `10cm` diameter telescope at a wavelength `5000Å` is of the orderA. `10^(6)red`B. `10^(-2)red`C. `10^(-4)red`D. `10^(-6)red`

A lens if placed between a source of light and a wall. It forms images of area` A_(1)` and `A_(2)` on the wall for its two different positions. The area of the source or light isA. `sqrt(A_(1)A_(2))`B. `(A_(1)+A_(2))/2`C. `(A_(1)-A_(2))/2`D. `(1)/A_(1)+(1)/A_(2)`

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment