Grade 12th PassGeneral Physics

a convex lens made of glass(RI=1.5) is put in water (RI=1.7). what will happen to its focal length?
1. decrease and change sign
2. increase and change sign
3. decrease and same sign
4. increase and same sign

rockandroll 0987

13 Years agoGrade 12th Pass

1 Answer

TANAYRAJ SINGH CHOUHAN

Approved Tutor Answer13 Years ago

The power of a lens depends on the differences in the refractive indices of the environment and the lens material. A glass lens immersed in water will loose power (a positive lens will focus at a greater distance). (This is for normal glass with refractive index greater than water - there could be glasses with refractive index less than water in which case the lens would gain power)

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a convex lens made of glass(RI=1.5) is put in water (RI=1.7). what will happen to its focal length?1. decrease and change sign2. increase and change sign3. decrease and same sign4. increase and same sign

rockandroll 0987

1 Answer

TANAYRAJ SINGH CHOUHAN

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a convex lens made of glass(RI=1.5) is put in water (RI=1.7). what will happen to its focal length?
1. decrease and change sign
2. increase and change sign
3. decrease and same sign
4. increase and same sign

. Because of the rotation of the earth, a plumb bob may not hang exactly along the direction of
the earth’s gravitational pull (its weight) but deviates slightly from this direction. Calculate the
deviation (a) at 40 latitude, (b) at the poles, and (c) at the equator