A myopic person has a power of -1.25 Dioptre. What is the focal length and nature of his lens ?
[CDS I 2016]
1) 50 cm and convex lens
2) 80 cm and convex lens
3) 50 cm and concave lens
4) 80 cm and concave lens
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A myopic person has a power of -1.25 Dioptre. What is the focal length and nature of his lens ?
[CDS I 2016]
1) 50 cm and convex lens
2) 80 cm and convex lens
3) 50 cm and concave lens
4) 80 cm and concave lens
4) 80 cm and concave lens
What is Dipotre ?
A measurement of power of lens.
What is the formula ?
P = 1/f
How to solve …
f= 100/p
= 100/125 = 80 cm
Why 100/P bcoz f should be in metre
-ve sign means concave lens + myopic person means near-sightedness …
So, d would be correct