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Identify the statements areTrue of False. a. The equation (mu_(2))/(v)-(mu_(1))/(u)=(mu_(12)-mu_(1))/(R) is applicabeltoa plane surface for R=oo . h. In the above equation, mu_(1) is medium in which the object is placed and mu_(2)is the medium in which the image is formed. c. In the figure shown, the real image of object O is formed at a distance 5R in the medium. d. In figure, the image of an object O place on the center face of the sphere is formed at infinity,. e. In fig , the image of an object O placed on the opposite face of the sphere is foremd at infinity. |
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Answer» Solution :a. True. For plane surfaces, `(mu_(2))/(v)=(mu_(1))/(u)` B. False. In the EQUATION, `(mu_(2))/(v)-(mu_(1))/(u)=(mu_(2)-mu_(1))/(R)` `mu_(1)` is the MEDIUM which comes before the boundary and `mu_(2)` is the medium which comes after the boundary. c. True. `(mu_(2))/(v)-(mu_(1))/(u)=(mu_(2)-mu_(1))/(R)` Here, `mu_(2)=1.5,mu_(1)=1, u=5R, R=+R` `(1.5)/(v)-(1)/(-5R)=(1.5-1)/(+R)` `(1.5)/(v)=(1)/(2R)-(1)/(5R)=(3)/(10R)` `v=5R` d. False. All the rays COMING out from the object are radial. The radial rays are not devited with the change in medium. e. True. `(mu_(2))/(v)-(mu_(1))/(u)=(mu_(2)-mu_(1))/(R)` Here, `mu_(2)=1, mu_(1)=2, R=-R` `u=-2R` `(1)/(v)-(2)/(-2R)=(1-2)/(-R)=(1)/(R)` or `(1)/(v)=(1)/(R)-(1)/(R) `rArr v=oo` 
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