Can we focus sunlight at a point using a mirror instead of magnifying Glass ?

Can we focus a sunlight at a point using a mirror instead of magnifying glass ?

Let us assume that you are on the moon. If you try to focus sunlight on a paper using magnifying glass, does the paper catch fire? Or not Why?

A man with normal near point (25 cm) reads a book with small print using a magnifying glass: a thin convex lens of focal length 5 cm. b) What is the maximum and the minimum angular magnification (magnifying power) possible using the above simple microscope?

Why do we use LED in the tester instead of a bulb ?

Which of the following statements are true in the context of a Compound Microscope? (A) Each lens produces a virtual and inverted image (B) The objective has a very short focal length (C) The eyepiece is used as a simple magnifying glass (D) The objective and eyepiece are convex and concave lenses respectively