A double convex lens has two surfaces of equal radii \(R\) and refractive index \(m=1.5.\) We have:
1. \(f=R/2\)
2. \(f=R \)
3. \(f=-R\)
4. \(f=2R\)

Subtopic:  Lens Makers' Formula |
 77%
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A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was \(4 D,\) the power of a cut-lens would be:
1. \(2 D\)
2. \(3 D\)
3. \(4 D\)
4. \(5D\)

Subtopic:  Lens Makers' Formula |
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A thin lens is made with a material having refractive index \(\mu=1.5\). Both sides are convex. It is dipped in water (\(\mu=1.33\)). It will behave like:
1. a convergent lens
2. a divergent lens
3. a rectangular slab
4. a prism

Subtopic:  Lens Makers' Formula |
 75%
From NCERT
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A convex lens is made of a material having refractive index \(1.2.\) Both the surfaces of the lens are convex. If it is dipped into water (\(\mu=1.33 \) ), it will behave like:

1. a convergent lens 2. a divergent lens
3. a rectangular slab 4. a prism
Subtopic:  Lens Makers' Formula |
 82%
From NCERT
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