15 - Optics Questions Answers

Physics >> Optics >> Refraction IIT JEE

Dear Sir request if you can help provide solution.

Asked By: RK GUPTA

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Physics >> Optics >> Interference, Diffraction and Polarisation IIT JEE

Asked By: KANDUKURI ASHISH

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Joshi sir comment

Physics >> Optics >> Reflection and Total Internal Reflection IIT JEE

A boy is walking under an inclined mirror at a constant

velocity V m/s along the x-axis as shown in figure. If the

mirror is inclined at an angle θ with the horizontal then

what is the velocity of the image?

Asked By: ASHISH JOSEPH

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Joshi sir comment

Physics >> Optics >> Refraction IIT JEE

Asked By: BHASKAR JHA

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Joshi sir comment

$L e t α i s s m a l l a n g u l a r d i s p l a c e m e n t A s s h o w n x = l \sin α a n d y = l \cos α / μ n o w u s e \sin^{2} α + \cos^{2} α = 1$

Physics >> Optics >> Dispersion and Deviation Board Exam

Can You Please Explain the Cartesian method for mirror and Lens?

Asked By: BONEY HAVELIWALA

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Joshi sir comment

Cartesian method is the method of sign convention

Sign Convention for Spherical Mirrors and Thin Lenses

Spherical Mirrors Lenses

Focal Length - for concave mirrors + for a converging lens

+ for convex mirrors - for a diverging lens

Object Distance - real object - real object

+ virtual object + virtual object

Image Distance - real image + real image

+ virtual image - virtual image

Magnification + for erect image + for erect image

- for inverted image - for inverted image

Physics >> Optics >> Reflection and Total Internal Reflection IIT JEE

when two plane mirror inclined to each other at an angle 60degree , the number of image =?

please explain with ray diagram .

Asked By: ASHOK SOLANKI

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Joshi sir comment

angle is 60

if object is placed symmetrical then images = 360/60 - 1 = 5

if unsymmetrical then 360/60 = 6

Physics >> Optics >> Interference, Diffraction and Polarisation IIT JEE

what is defination of polarization

Asked By: SAIFALI SALIM JAMADAR

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Joshi sir comment

Polarisation is the phenomenon to turn light in a particular direction by any means

Physics >> Optics >> Interference, Diffraction and Polarisation Medical Exam

for an aperture of size a illuminated by a parallel beam of light having wavelength λ the fresnel distance is

ans a^2/λ what is fresnel dist.??

Asked By: SARIKA SHARMA

is this question helpfull: 2 0 read solutions ( 1 ) | submit your answer

Joshi sir comment

fringe width β = λD/d

for β = d , D is called fresnel distance

so d²= λD

so D = d²/ λ

now change d by a

Physics >> Optics >> Dispersion and Deviation Medical Exam

which physical quantity has its unit as LUX??

Asked By: SARIKA SHARMA

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Joshi sir comment

its illuminance

Physics >> Optics >> Refraction Medical Exam

if ω_{1 &}ω₂ are dispersive powers of lenses of focal length f1 & f2 respectively . then the condition of chromatic aberration for two lenses in contact is

1) ω1/ω2 = f2/f1

2) ω1/ω2 = f1/f2

3) ω1/ω2= - f1/f2

4) ω2/ω1= f1/f2

Asked By: HIMANSHU

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Joshi sir comment

3 is the true condition and can be proved

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