The focal length of a ……………... lens is p...

The focal length of a ……………... lens is positive.

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The focal length of a `ul("convex")` lens is positive .

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Assertion: If object is placed at infinity, then a virtual image will be formed at first focus of a concave lens. Reason: First focal length of a concave lens is positive.

If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.

If both Assertion is true, but the Reason is false.

If both Assertion is false but the Reason is true.

`+ 10 ` cm

` + 20 cm`

` - 10 cm`

` - 20 cm`

radii of curvatures of two suface only.

refaractive index of the lens material only.

length of the lense.

both radii of curvature of two surfaces and refractive index of the lens material.