What precaution must be taken by students when making observations of the Sun?
Use only new equipment. Use a very strong telescope. Project image onto a piece of cardboard. Look at the Sun only in the morning.
Question: What precaution must be taken by students when making observations of the Sun?
A. Use only new equipment.
B. Use a very strong telescope.
C. Project image onto a piece of cardboard.
D. Look at the Sun only in the morning.
Answer: