Starting from very far away, an object is moved closer and closer to a concave lens, eventually reaching the lens. What happens to its image formed by that lens? (There could be more than one correct choice.)
A) The image gets closer and closer to the lens.
B) The image gets farther and farther from the lens.
C) The image always remains virtual.
D) The image eventually changes from real to virtual.
E) The image keeps getting larger and larger.
A, C, E
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Which of the following planets cannot be seen with the naked eye?
A) Venus B) Mars C) Jupiter D) Saturn E) Neptune
Describe the process of crystallization.
What will be an ideal response?
Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. How long does it take for them to meet?
What will be an ideal response?
A gas initially is at a pressure of 35 kPa. If its volume is halved while the absolute temperature is kept constant the new pressure will be ________ kPa.
Fill in the blank(s) with the appropriate word(s).