Ray Optics [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 67 - 71 of 160
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Question 67
Question MCQ▾
A convex lens of power 4D is kept in contact with a concave lens of power 3D, the effective power of combination will
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 68
Question MCQ▾
Two plane mirrors are inclined to each other at some angle. A ray of light incident at 30° on one, after reflection from the other retraces its path. The angle between the mirrors is
Choices
Choice (4) | Response | |
---|---|---|
a. | 30° | |
b. | 90° | |
c. | 45° | |
d. | 60° |
Question 69
Question MCQ▾
A convex lens when placed in the first position forms a real image of an object on a fixed screen. The distance between the object and the screen is 75 cm. On displacing the lens from first position by 25 cm to the second position again a real image is formed on the screen. Then the focal length of the lens is
Choices
Choice (4) | Response | |
---|---|---|
a. | 33.3 cm | |
b. | 50.3 cm | |
c. | 16.7 cm | |
d. | 25.0 cm |
Question 70
Question MCQ▾
A prism having an apex angle 4° and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror?
Choices
Choice (4) | Response | |
---|---|---|
a. | 178° | |
b. | 4° | |
c. | 2° | |
d. | 176° |
Question 71
Question MCQ▾
A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror. Find the approximate size of the image.
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. | None of the above |