Question

According to Cartesian sign convention, which mirror and which lens has negative focal length?

Answer 1

concave mirror and concave lens has the negative focal length ...

Answer 2

Dear Student,

◆ Answer -

According to Cartesian sign convention, concave mirror and concave lens has negative focal length.

● Cartesian sign conventions -

• Pole of sperical mirror or Principal focus of spherical lens is considered as origin.
• Object is placed on the left and light falls from left to right.
• Distances on the right side of pole/focus are positive.
• Distances on the left side of pole/focus are negative.
• Distances measured upwards from pole/focus are positive.
• Distances measured downwards from pole/focus are negative.
• Concave lens and concave mirror are have negative focal length and convex lens and convex mirror have positive focal length.

Thanks dear. Hope this helps you...