For a concave mirror, an object placed between focus and pole produces:
Virtual, erect, enlarged
When an object is placed between the focus and pole of a concave mirror, the image formed is virtual, erect, and enlarged, appearing behind the mirror -- this is the principle used in shaving/makeup mirrors.
The power of a lens is \(-2D\). The lens is:
Two convex lenses have focal lengths of 50 cm and 25 cm, respectively. If these two lenses are placed in contact, then the net power of this combination will be equal to
The refractive index of crown glass is close to 3/2. If the speed of light in air is c, then the speed of light in the crown glass will be close to
Tyndall effect is a phenomenon of