Light Physics ICSE 10

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Q1. Define refractive index.

Q2. What is the unit of refractive index?

Q 3. What type of image is formed by a concave lens?

Q 4. A lens forms an erect image for all positions of the object in front of it. Is the lens convex or concave?

Q 5.Define power of a lens. What is its unit?

Q6.   State the laws of refraction.

Q 7. Diagrammatically represent the refraction of light through a rectangular glass slab.

Q 8. Draw a ray diagram to show the position and nature of the image formed by a convex lens when the object is placed
a) at 2F₁
b) between F₁ and 2F₁
c) beyond 2F1

Q 9. The bending of a beam of light when it passes obliquely from one medium to another is known as _______.

Q 10. Where should an object be placed so that a real and inverted image of the same size is obtained, using a convex lens?

Q 11. A convex lens is called _________.

Q 12. Draw dot and cross diagrams for the following molecules.
a. CO_2.                         b. H₂O

Q 13. Nme 5 types of atoms that form covalent bonds and 5 types of atoms that from ionic bonds.

Q 14. What is the difference between valence, and number of valence electrons?

(Q.20)  An object placed at F of a concave mirror will produce an image
(a) At focus      (b) Diminished            (c) Real and Inverted (d) Virtual  (Q.21)  An object placed at infinity of a concave mirror will produce an image
(a) Behind the mirror(b) Diminished(c) Virtual and erect(d) Enlarge  (Q.22)  An object placed at F of a concave lens will produce an image
(a) On opposite side of the object(b) Enlarge(c) Virtual and erect(d) Real and inverted (Q.23)  An object placed at 2F of a convex lens will produce an image
(a) At 2F(b) Enlarge(c) Real and Inverted(d) Virtual  (Q.24)  An object placed between F and 2F of a convex lens will produce an image
(a) Virtual(b) Diminished(c) Real and Inverted(d) Erect  (Q.25)  According to the laws of refraction (Snell’s law)

(a) Angle i = Angle r(b) Sine i = sine r(c) Sine i / Sine r = constant(d) tan i= tan r
 

(Q.26)  Absolute Refractive index of a substance is

(a) Speed of light in vacuum / Speed of light in the medium(b) Speed of light in water / Speed of light in the medium(c) Speed of light in the medium / Speed of light in air(d) Speed of light in medium/speed of light in water