121. Total internal reflection can occur when light tends to pass from

1. 1. A denser to a rarer medium

   
   
   

   2. A rarer to a denser medium

   
   
   

   3. One medium to another of equal refractive index

   
   
   

   4. None of the above

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

---

122. A concave mirror forms the image of an object on a screen. If the lower half of the mirror is covered with an opaque card, the effect would be

1. 1. To make the image less bright

   
   
   

   2. To make the lower half of the image disappear

   
   
   

   3. To make the upper half of the image disappear

   
   
   

   4. To make the image blurred

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

---

---

123. A number of images of a candle flame are seen in thick mirror

1. 1. The first image is the brightest

   
   
   

   2. The second image is the brightest

   
   
   

   3. The last image is the brightest

   
   
   

   4. All Images are equally brightest

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

---

124. Two plane mirrors are inclined at 70°, A ray incident on one mirror at angle 0. After reflection, falls on the second mirror and is reflected from there parallel to the first mirror 0 is.

1. 1. 50°

   
   
   

   2. 45°

   
   
   

   3. 30°

   
   
   

   4. 55°

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

---

---

125. The magnifying power of a compound microscope is

1. 1. Objective magnification / eye piece magnification

   
   
   

   2. Eyepiece magnification X objective magnification

   
   
   

   3. Eyepiece magnification / objective magnification

   
   
   

   4. Objective magnification + objective and eye-piece of

   
   
   

---

1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

---