RAY OPTICS AND OPTICAL INSTRUMENTS QUIZ - 19

JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts..

Q1. A concave lens with unequal radii of curvature made of glass ( Î¼g = 1.5 ) has a focal length of 40 cm. If it is immersed in a liquid of refractive index Î¼1 = 2, then
•  It behaves like a convex lens of 80 cm focal length
•  It behaves like a convex lens of 20 cm focal length
•  Its focal length becomes 60 cm
•  Nothing can be said
Solution

Q2.
•  n1 < n2 < n3
•  n2 < n1 < n3
•  n1 < n3 < n2
•  n3 < n1 < n2
Solution

Q3. An equiconvex lens is made from glass of refractive index 1.5. If the radius of each surface is changed from 5 cm to 6 cm, then the power
•  Remains unchanged
•  Increases by 3.33 D
•  Decreases by 3.33 D
•  Decreases by 5.5 D
Solution

Q4. A diver in a swimming pool wants to signal his distress to a person standing on the edge to the pool by flashing his waterproof flashlight
•  He must direct the beam vertically upward
•  He has to direct the beam horizontal
•  He has to direct the beam at an angle to the vertical which is slightly less than the critical angle of incidence for total internal reflection
•  He has to direct the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection
Solution

Q5.
•  | m AB | < 1 and | m ED | < 1
•  | m AB | > 1 and | m ED | < 1
•  | m AB | < 1 and | m ED | > 1
•  | m AB | > 1 and | m ED | > 1
Solution

Q6.
•  1.4
•  1.3
•  1.2
•  1.6
Solution

Q7. A large glass slab ( Î¼ = 5/3 ) of thickness 8 cm is placed over a point source of light on a plane surface. It is seen that light emerges out of the top surface of the slab from a circular area of radius R cm. What is the value of R?
•  6 cm
•  7 cm
•  8 cm
•  9 cm
Solution

Q8. The focal length of the lens used in question 118 is
•
•  T
•
•
Solution

Q9. A converging lens is used to form an image on a screen. When upper half of the lens is covered by an opaque screen
•  Half the image will disappear
•  Complete image will be formed of same intensity
•  Half image will be formed of same intensity
•  Complete image will be formed of decreased intensity
Solution

Q10. A clear transparent glass sphere ( Î¼ = 1.5 ) of radius R is immersed in a liquid of refractive index 1.25. A parallel beam of light incident on it will converge to a point. The distance of this point from the center will be
•  -3 R
•  +3 R
•  -R
•  +R
Solution

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