Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

JEE Class main Answered

Solve
question image
Asked by sarveshvibrantacademy | 04 May, 2019, 10:29: AM
answered-by-expert Expert Answer
For refracrion at spherical surface, with respect to the given figure, we have begin mathsize 12px style n subscript a over d subscript 1 plus n subscript g over v space equals space fraction numerator n subscript g minus n subscript v over denominator R end fraction end style  ................(1)
In eqn.(1) sign convention is not applied. v is image distance in refracting medium,  measured from point p.
R is radius of curvature which is 60 cm.
 
Let us analyze each case
 
case-(A) :-  eqn.(1) is written as  (-1/120) + (1.5/v) = (0.5/60)   or we get  v = 60 cm.
 
i.e image after refraction is formed at a distance 60 cm from P inside refracting medium.
 
Now if this image is acting as object for second refraction then we have   [ (-3/2)/60 ] + 1/v = 0.5/(-60)   or we get v = 60 cm.
 
Hence final image I1 is not formed on O which is 120 cm left of P , irrespective of distance d2

 
case-(B) :- eqn.(1) is written as (-1/240)+(1.5/v) = 0.5/60   or we get v = 120 cm
 
i.e image after refraction is formed at a distance 120 cm from P inside refracting medium.
 
Now if this image is acting as object for second refraction then we have   [ (-3/2)/120 ] + 1/v = 0.5/(-60)   or we get v = 240 cm.
 
Hence final image I1 is formed on O , but the distance d2 should be greater than 120,
otherwise mirror reflection will alter the location of first image and final image will not be formed at O
 
case-(C) and (D) are false as per the explanataion given for case -(B)
Answered by Thiyagarajan K | 05 May, 2019, 15:52: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
JEE main - Physics
a marble block of mass 2 kg lying on ice when a given velocity of 6 ms–1 is stopped by friction in 10 seconds then co efficient of friction is
Asked by sumalathamadarapu9 | 23 Oct, 2024, 22:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
show that the frequency of oscillations remain unchanged whether a mass attached to a spring is made to oscillate in the vertical or in the horizontal direction
Asked by py309649 | 13 Oct, 2024, 13:39: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
Square of the time period of revolution of a planet is proportional to the cube of the mean distance between sun and planet. If mean distance is increased by 2% then percentage change in its time period is
Asked by coolskrish | 13 Oct, 2024, 12:50: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
two particles of mass m and 4m are initially actress the sad moving towards each other due to mutual gravitational force at an instantly of m is vî then at this instant the velocity of mass 4m is
Asked by midnightmoon3355 | 09 Oct, 2024, 09:09: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
what is the second law of thermodynamics
Asked by rambabunaidu4455 | 03 Oct, 2024, 16:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
what is the relation between drift velocity and mobility
Asked by ratchanavalli07 | 17 Sep, 2024, 07:46: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
A ball of mass m approaches a moving wall of infinite mass with speed v along the normal to the wall. The speed of the ball is u towards the ball. The speed of the ball after elastic collision with the wall is
Asked by yayashvadutta45 | 15 Sep, 2024, 19:47: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
a current of 2a is flowing through a conductor of length 22m bent in arc radius 5cm
Asked by adithireddy999 | 03 Sep, 2024, 09:35: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
two vectors vector a and vector B lie in one plane vector c lie in the different plane then vector a + vector b + vector c is
Asked by vaishalinirmal739 | 29 Aug, 2024, 18:07: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
What is impulse?
Asked by vradhysyam | 26 Aug, 2024, 17:17: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt