Related Questions

Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?
A -4.33 diopters
B 12.33 diopters
C -12.33 diopters
D 4.33 diopters
একটি দ্বি-উত্তল অভিসারি লেন্সের প্রত্যেক পৃষ্ঠের বক্রতার ব্যাসার্ধ 30cm এবং গ্লাসের প্রতিসরাঙ্ক 1.50। লেন্সটির ফোকাস দৈর্ঘ্য কত হবে? (The radius of curvatures of both surfaces of a double convex lens are 30cm each and refractive index of glass is 1.50. What will be focal length of the lens?)
A 15 cm
B 30 cm
C 45 cm
D 60 cm
In a concave mirror when the object is placed at infinity which of the following applies to the image?
A Real, inverted, highly enlarged image at center of curvature (C)
B Real, inverted image of the same size at centre of curvature (C)
C Real, inverted, diminished image between centre of curvature (C) and principal focus (F)
D Real, inverted, highly diminished image at focus
In case of a concave mirror, if an object is kept between principal focus F and pole P of the mirror, then which one of the following statements about the image is not correct?
A The image will be virtual
B The image will be enlarged or magnified
C The image will be formed at infinity
D The image will be erect
Find the position of the image formed by a concave mirror when the object is placed between P and F?
A At infinity
B Between F and C
C Behind the mirror
D Beyond C
Which of the following function creates a CSS gradient image that can be used anywhere an image URL is required, including background-image, border-image, and list-style properties?
A canvas
B gradient
C animation
D color
A form sorting machine can sort 12 forms in 10 minutes. How many forms can it sort in one and half hours at this rate ?
A 150
B 158
C 152
D 108
If special forms are needed for printing the output, the programmer specifies these forms through
A JCL
B IPL
C Utility programs
D Load modules
Identify the incorrect word/phrase in the following: Many who are (a) boring  with traditional forms of examination (b) can be seen to have passionate interest (c) In solving problems (d) presented  in popular puzzle forms.
A a
B b
C c
D d
1m ফোকাল লেংথের একটি উত্তল ( convex ) এবং 10 cm ফোকাল লেংথের একটি অবতল ( concave) লেন্স ব্যবহার করে একটি টেলিস্কোপ তৈরী করা হলে টেলিস্কোপটির দৈর্ঘ্য কত হবে?
A 80 m
B 85 cm
C 90 cm
D 95 cm

Next steps