The unit of power of a lens is —

এই অধ্যায়ের আরও প্রশ্ন

• C-09-Q102In the formula , must be expressed in —
• C-09-Q103The smaller the focal length of a converging lens —
• C-09-Q104The power of a convex lens is —
• C-09-Q105The power of a concave lens is —
• C-09-Q106If the power of a lens is 2.5 D, its focal length is —
• C-09-Q107Where will the image of an object be when it is placed in a denser medium and looked at from a rarer medium?
• C-09-Q108Based on Figure 9.30 (ray incident along the normal at point P), what is the angle of refraction?
• C-09-Q109In Figure 9.30, what will happen if the angle of incidence is increased (light from denser to rarer medium)?
• C-09-Q110The ray diagram usually used to draw the image for a convex lens uses — (i) parallel ray through focus, (ii) r
• C-09-Q111Which is the unit of power of a lens?