Mirror Image of a Clock

Clock का Mirror Image

title

Mirror Image of a Clock

  • Mirror & Water Images
  • Mirror Image of a Clock
नमस्ते दोस्तों! MeraExam में आपका स्वागत है। आज हम सीखेंगे — Clock का Mirror Image। मैं promise करती हूँ, आज के बाद ये topic आपको आसान लगेगा। शुरू करें?
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Learning Objective

Find the mirror-image time of any clock reading using a one-line subtraction.

🎯 Learning Objective

Find the mirror-image time of any clock reading using a one-line subtraction.

💡 Concept

  • Mirror image of a clock time = 11:60 − shown time (subtract hours from 11, minutes from 60)
  • Shown time + mirror time always adds up to 12:00 — use it as an instant check
  • For times between 11:00 and 1:00, use 23:60 − shown time instead
  • If the minutes come out as 60 (e.g. 6:60), roll it forward to the next hour (7:00)
  • This is a left-right flip of the dial, so 12 and 6 stay put while the hands swing across
  • No drawing needed — the subtraction does all the work

🧮 Key Formulas

Mirror time = 11:60 − shown time

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Shown time + Mirror time = 12:00

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Between 11 and 1 o'clock → use 23:60 − shown time

✏️ Easy Example

Q. A clock shows 3:30. What time will its mirror image show?

  1. Mirror time = 11:60 − 3:30
  2. Hours: 11 − 3 = 8; Minutes: 60 − 30 = 30

Answer: 8:30

🇮🇳 Real-Life Example

Snap a selfie holding a wall clock and the time reads backwards — the phone's front camera shows a mirror image, exactly the 11:60-minus-time flip.

📝 Exam-Level Example

Q. A clock shows 7:20. Find the time in the mirror.

  1. Mirror time = 11:60 − 7:20
  2. 11 − 7 = 4 hours, 60 − 20 = 40 minutes
  3. Check: 7:20 + 4:40 = 12:00 ✓

Answer: 4:40

📝 Exam-Level Example

Q. A clock shows 9:15. What is its mirror-image time?

  1. Mirror time = 11:60 − 9:15
  2. 11 − 9 = 2 hours, 60 − 15 = 45 minutes

Answer: 2:45

🪄 Memory Trick

Never draw the clock. Do 11:60 − time in your head, then confirm with shown + mirror = 12:00.

⚠️ Common Mistakes

  • ❌ Subtracting the minutes without borrowing — always take minutes from 60, not from 00
  • ❌ Using the water rule (top-bottom) on a mirror-clock question
  • ❌ Forgetting the 23:60 version for times between 11 and 1 o'clock

🏆 Exam Tips

  • ✅ The 12:00 check catches almost every slip instantly
  • ✅ Practise until 11:60 − time is automatic — these are guaranteed 10-second marks

📌 Summary

  • Mirror time = 11:60 − shown time
  • Shown + mirror = 12:00 (free check)
  • Between 11 and 1 → use 23:60 − shown time
  • Roll 6:60 forward to 7:00
PreviousWater Images — Top Becomes Bottom