8. Which of following images is impossible to be generated by a concave mirror? (A) a real, inverted, reduced image (B) a real, inverted, enlarged image (C) a virtual, upright, enlarged image (D) a virtual, upright, reduced image (E) none of the above.

9. According to the First Law of Thermodynamics, if a closed system absorbs heat Q from its surroundings and does work W on its surroundings, what is the change in the internal energy of the system, ΔU? (Sign convention: heat absorbed is positive, work done by the system is positive) (A) ΔU = Q + W (B) ΔU = Q - W (C) ΔU = W - Q (D) ΔU = -Q - W

8. Which of following images is impossible to be generated by a concave mirror?

(A) a real, inverted, reduced image

(B) a real, inverted, enlarged image

(C) a virtual, upright, enlarged image

(D) a virtual, upright, reduced image

(E) none of the above.

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