1 The power of the lens with focal length 20 cm is
a. 3D b. 5D c. 15D d. 4D
2 .Saturated hydrocarbons can never undergo.
a. Oxidation b. Addition Reaction c. Substitution reaction d. Dehydration reaction
3 In optics an object which has higher refractive index is called ............... .
a. Optically rarer b. Optically denser c. Optical density d. Refractive index
4 The structure of launch vehicle is decided by
a. weight of satellite b. type of satellite orbit c. Both a and b d. None of the above
Answers
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Answer:
In optics, an object which has higher refractive index is called
(a) optically rarer
✔️(b) optically denser
(c) optical density
(d) refractive index
Hope this helps you ☺️
Explanation:
Answered by
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1) The power of the lens with focal length 20 cm is
a. 3D b. 5D c. 15D d. 4D
Answer:
Given: Focal length = f = 20 cm = 0.2 m
Power of the lens = P = ?
Explanation:
P = 1/f(m)
= 1/0.2
= 5 D
:- The power of the lens is 5 D.
:. Option b. 5D is correct
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