Question

Assertion(A):
A convex lens of focal length 30 cm can't be used as a simple microscope
in normal setting.
Reason (R):
For normal setting, the angular magnification of simple microscope is
M=D/f​

Answer 1

Answer:

Assertion is true but Reason is false.

Explanation:

As we know normal setting means L.D.D least distance of distinct vision. So for a normal human it is 25 cm. But In this situation it is 30cm . so it can't be used for simple microscope in normal setting.

But we all know the angular magnification for normal setting/ least distance of distinct vision is :- M=1+D/f.

angular magnification at infinity is :- M=D/f.

so the reason is wrong. As the question is for normal setting not for infinity

Answer 2

Answer:

The Assertion as well as Reason are both correct statements here but the Reason isn't the correct explanation of the Assertion.

Explanation:

When an object is observed, the light coming into the attention forms an actual (and consequently inverted) at the retina, the "screen" in the back of the eye.

Without the want for an in depth ray diagram, we are able to predict the dimensions of the image at the retina, genuinely remembering that a ray via the optical center of a lens (or device of lenses) passes through center undeviated.

The size of the image at the retina of the observer relies upon on two instead apparent factors:

1. The actual size of the object, h.
2. The space of the item from the observer, u.

Optical devices like microscopes and telescopes offer magnification through growing the dimensions of the attitude subtended at the eye.