Glass used in making lenses and prisms

Question 129 The type of glass used in making of lenses and prisms is?
A. Flint glass
B. Pyrex glass
C. Soft glass
Answer: Flint glass

Question 130 Consider the following statements:
A. Jivaka was personal physician of Buddha
B. Jivaka studied Ayurveda in takshashila university.
1. Both are correct.
2. Only A is correct.
3. Only B is correct.
Answer: Both are correct.

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The upper and lower portions in common type of bi-focal lenses are respectively

Question 126 The upper and lower portions in common type of bi-focal lenses are respectively
A> concave and convex
B> both concave of different focal lengths
C> convex and concave
D> both convex of different focal lengths
Answer: both convex of different focal lengths
Explanation: most convex lenses in the lower half of the frame and the least convex lenses on the upper part. Means both convex lenses of different focal lengths.

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