Image formed by a plane mirror is : a) virtual, behind the mirror and enlarged
b) virtual, behind the mirror and of the same size as the object
c) real, at the surface of the mirror and enlarged
d) real, the mirror and of the same size as the object

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.